Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaed319ea797622f…

MALICIOUS

PDF

118.1 KB Created: 2021-05-19 07:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ec23e9b9c807f4d4866babb03fb048de SHA-1: 7764126ad108ba9cc86d3a0293a6cdfd2b334b8d SHA-256: aaed319ea797622f8d336effa51337cbadc74efcc0b57c63a2cab86f4ebdb16d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary URL observed is https://zajinet.ru/strik?utm_term=trigonometric+ratios+chief+sohcahtoa+worksheet+answers, which is likely the intended destination for the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=trigonometric+ratios+chief+sohcahtoa+worksheet+answers PDF link annotation
    • https://witiwalaligizis.weebly.com/uploads/1/3/1/6/131607575/2977819.pdfIn PDF document text
    • https://lunidopufakim.weebly.com/uploads/1/3/4/4/134482460/4123127.pdfIn PDF document text
    • https://sokimazivad.weebly.com/uploads/1/3/4/6/134620474/zikesu.pdfIn PDF document text
    • https://sivobevabe.weebly.com/uploads/1/3/4/6/134665070/kaladeb-wageroru-lobaf.pdfIn PDF document text
    • https://nakafafokebupop.weebly.com/uploads/1/3/1/4/131437029/xubelotuluginavidi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484618/normal_5fced500e48e3.pdfIn PDF document text
    • https://pixiguva.weebly.com/uploads/1/3/2/6/132681827/d987d611c5.pdfIn PDF document text
    • https://futinenapol.weebly.com/uploads/1/3/1/4/131438538/kosamomu_pifedudak_tefuxufazilim_nojifi.pdfIn PDF document text
    • https://xamilugalaw.weebly.com/uploads/1/3/5/3/135325617/dcad23d3e53ade.pdfIn PDF document text
    • https://zuwuwuxi.weebly.com/uploads/1/3/4/8/134883554/9248687.pdfIn PDF document text
    • https://babixapimobikig.weebly.com/uploads/1/3/4/8/134873785/ac85f22.pdfIn PDF document text
    • https://merotulup.weebly.com/uploads/1/3/4/0/134000288/lekavunigereke.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/082236a879ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506063/normal_5fcb4a0c79f34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478414/normal_5feea2b6117f9.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://selitesavuweg.epizy.com/balancing_chemical_equations_practice_problems_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53083d12-9b16-46ba-927d-18acce267440/the_new_oxford_picture_dictionary_english_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76091140-dd1e-43f4-a893-aac657e7d905/bowflex_power_pro_xtl_power_rods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe167cd2-e9b2-4a69-8a14-f48cda4c6481/supawadoziresunutunam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d25357-c1b8-48e5-9d90-070eba45dfb4/sears_craftsman_router_table_25444_manual.pdfIn PDF document text
    • http://fafumemoponan.rf.gd/casio_hr-150tm_calculator.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAB 2032 bytes
SHA-256: 5d13a60648d4b82ac4b55fe60575adf48ca9b99de572b27f0637214ba78a3957
font_01_sfnt_off00014506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14506 3864 bytes
SHA-256: 60a0ad99c2e4e36496b84d67da9071b74e6a6058314fda0b9bd7439dc1adfaf7
font_02_sfnt_off000152f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F3 5368 bytes
SHA-256: 7bfd2ccd92c8203477ceaa6821e6fe8849b072742d94da735d668dd646f5016e
font_03_sfnt_off00016526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16526 18480 bytes
SHA-256: fd6b63ba8b38a0713b3aa786347ea2cc22ac867c42267b796fd1207982e03e2f
font_04_sfnt_off0001a090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A090 17072 bytes
SHA-256: 9a92f90686cc4af8861050d67a50b0b8de888661bcce9cff574e3c6eeb13bf08
font_05_sfnt_off0001b951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B951 6136 bytes
SHA-256: 451ef98c189d9b950254d135d46160e616c4046d93a2ede8e20ed9125387b16f

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