Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffba4c87ffbe2c4…

MALICIOUS

PDF

92.7 KB Created: 2021-04-03 15:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c4b14974e9b42816cbfb09354006f99c SHA-1: 7a92629b9ca9036b1fee9ada69c829f1cd395d6c SHA-256: 8ffba4c87ffbe2c4988e3e6309f50f4d2fe0be89120da852f9396b8d67ec286d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URLs, 'https://dugedepap.ru/strik?utm_term=doll+houses+for+kids', is suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://dugedepap.ru/strik?utm_term=doll+houses+for+kids PDF link annotation
    • http://goodsun.fun/fire_drill_checklist_template_ukv2ena.pdfIn PDF document text
    • http://giocodigital.fun/8563869519291vq1.pdfIn PDF document text
    • http://rodsfish.club/combine_similar_terms_calculatoro3qs1.pdfIn PDF document text
    • http://vzroslyh.net/mijepuj5agi.pdfIn PDF document text
    • https://fosisejabevenot.weebly.com/uploads/1/3/5/3/135398983/6324465.pdfIn PDF document text
    • https://mewarikubunaku.weebly.com/uploads/1/3/1/6/131637951/d988822.pdfIn PDF document text
    • http://btsworld.org/8869314422ymoze.pdfIn PDF document text
    • http://expressvpn.store/825049822593ajkv.pdfIn PDF document text
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/346534.pdfIn PDF document text
    • https://kosazalosir.weebly.com/uploads/1/3/2/8/132815054/ce0d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tokit/50240986009.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/66326836310.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/54176073965.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/wedding_day_wishes_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92658a4b-066f-466d-9c23-a6b63a9eca2b/sitawosozote.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/86567574138.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/acecqa_responsible_person_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/average_starting_salary_international_business_major.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf9d88c2-244e-438d-9616-1d9948de9289/sosinawimuwojixikafejole.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/zezowemesot.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/99847521135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4f34d8d-d640-4857-9ebb-cfcd42f8c4f3/how_to_fix_refrigerator_ice_maker_water_line.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 4848 bytes
SHA-256: be788ed6304700dfe9e0c6625b7fb8839c61ce2202fa173845be4475c9838f1b
font_01_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 13512 bytes
SHA-256: a740e71d0fe4529a14e88014a3b2407df6137577e3be115e89a6062398156073
font_02_sfnt_off00014abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABD 17652 bytes
SHA-256: e3b039889e94ca1156540dbb1f26f733dc8f91de3a1e5c91250a5fa7cf1923b4

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