Malicious PDF — malware analysis report

Static analysis result for SHA-256 85027df355da3b10…

MALICIOUS

PDF

87.0 KB Created: 2021-03-24 04:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d76c0f3d5b66faa14070248cfc453802 SHA-1: f4266de5c0dd60df095ec7f97c5af2437de70397 SHA-256: 85027df355da3b10b6f1459909a15e55858f4b40db7ecd5b4d32ac88dab5c788
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is designed to host and present these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://xezojetit.ru/123?utm_term=svr+secret+video+recorder+pro+apk PDF link annotation
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/xejuluzazufatase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5fe6944d4466a.pdfIn PDF document text
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/5c04007e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5fd27c07c0f9d.pdfIn PDF document text
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/zewujuwuxajosaru.pdfIn PDF document text
    • https://retotanenumu.weebly.com/uploads/1/3/4/0/134017544/24312ff3183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478422/normal_603830fe62e56.pdfIn PDF document text
    • http://tepazoropev.iblogger.org/playhouse_plans_free.pdfIn PDF document text
    • http://roserubusigiwij.mywebcommunity.org/cover_letter_for_job_example.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451210/normal_5ff7fe65893ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_60308b2f0b03a.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/cervical_cancer_stages.pdfIn PDF document text
    • https://sudarixadozitot.weebly.com/uploads/1/3/5/3/135331315/melisebasisujol.pdfIn PDF document text
    • https://suruwatofu.weebly.com/uploads/1/3/4/8/134868782/2742632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486035/normal_60263c2da7852.pdfIn PDF document text
    • http://rakuropa.iblogger.org/bezitexi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461202/normal_5ff34bc9943f1.pdfIn PDF document text
    • https://pazunorafozide.weebly.com/uploads/1/3/0/7/130776571/8746994.pdfIn PDF document text
    • https://xuzitimezavut.weebly.com/uploads/1/3/1/8/131856372/3924242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477164/normal_6013e52eac388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zebikijixikemas.rf.gd/echo_weed_eater_string_stuck_inside.pdfIn PDF document text
    • http://nikavavufuxirel.epizy.com/57723633931.pdfIn PDF document text
    • http://gukutimaguvuzum.onlinewebshop.net/cell_cycle_regulation_and_cancer.pdfIn PDF document text
    • http://fanodawenu.rf.gd/tepovajaxidinusekuviwi.pdfIn PDF document text
    • http://gubawakelu.onlinewebshop.net/83504011935.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 4944 bytes
SHA-256: 8cd3d29061418e00e6df66c2b915ce37f23be1ff74711b622bd7020fb652de49
font_01_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 11240 bytes
SHA-256: f0a01f56d18ea0911ec245773ce5dcb9e9f15586d4d74f739871ea749344bfc0
font_02_sfnt_off000128da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DA 16852 bytes
SHA-256: e33e09bfb3e9a72ac2f7d3a80fced4a44038e258ab4fe52af243b6ace7bcec51
font_03_sfnt_off00013ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFA 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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