Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4446f8ad45c6b1…

MALICIOUS

PDF

82.9 KB Created: 2021-02-28 21:02:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 33e60349b85a4761e02a7af841933f11 SHA-1: ea47eb036ec329ccbc974e610c7477436341205b SHA-256: 8a4446f8ad45c6b10f0282b315aa19c81b9a6ba59c0080b397f22b159b4ac67c
216 Risk Score

Malware Insights

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

The file is a PDF that impersonates Facebook, a strong indicator of credential phishing. It contains numerous external links, including one pointing to a redirector hosted on weebly.com, suggesting a multi-stage attack. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to lead the user to a phishing page or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/jadivefizesubosaxumo.pdf.
  • 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/wix?keyword=8+ball+pool+apk+unlimited+coins PDF link annotation
    • https://cdn.sqhk.co/nujidegowupi/cLhhggb/jevusosuridowuxatadugiruw.pdfIn PDF document text
    • https://cdn.sqhk.co/fopalixogul/Whinjd4/dolatesarunamaresopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502175/normal_603b33939f6f1.pdfIn PDF document text
    • https://cdn.sqhk.co/poxofufiko/c7Mgiji/free_walmart_photo_coupon_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_60285a7f5d817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_5fdc8842ea47c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366324/normal_5fcf9b793b6aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411219/normal_5ffa802228751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415531/normal_5ff76e95d37ca.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/17901661046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369174/normal_5ff766a8c0d62.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/jadivefizesubosaxumo.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/cwBidhg/mavoforatozasumuru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 5424 bytes
SHA-256: 2cbfdd1ed0f159a33f5e556fdae11c5b4eb75b92af1b5ed05328f01f33c40ce8
font_01_sfnt_off00011af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 10472 bytes
SHA-256: 8644b74b563a733a9491449c2ed2908bf1093548bae14de4baa9f5fecf2e961e

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