Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c450f535012bd4…

MALICIOUS

PDF

76.1 KB Created: 2020-12-01 00:43:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8873249f0906113c0966b0999b88324c SHA-1: df5e3d9111a3f1b981c3839d6e1e10167be09e55 SHA-256: a2c450f535012bd436c5515eb7e8cadaabff8c2b0339fe1683ccf4f581a271c1
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document exhibits multiple indicators of malicious activity, including a critical heuristic flagging it as a brand-impersonation credential phishing lure related to Outlook. It also contains a large number of external links, with one specifically identified as a link farm, suggesting SEO manipulation or hosting of further malicious content. The presence of a callback phishing lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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://gifavunebaxagem.weebly.com/uploads/1/3/4/3/134358660/peraju-rizawim.pdf.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafftec.ru/123?utm_term=va+citrix+access+gateway+vpn PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f8ab42db6a0b.pdfIn PDF document text
    • https://gifavunebaxagem.weebly.com/uploads/1/3/4/3/134358660/peraju-rizawim.pdfIn PDF document text
    • https://wubawujol.weebly.com/uploads/1/3/4/2/134266052/dowirufodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424682/normal_5faa59dac43ff.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/kasuwevovog/showbox_apk_5.35_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738ce4e8-001e-4ea4-80fd-017da8fcc94b/noxonur.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfff689955c744b536924c/t/5fc146c0f8cdb769c6127848/1606502081815/reebop_lab_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/57739946910.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/birds_of_a_feather_guide_ac_odyssey.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/nuwok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a36e6341-4e5d-4fed-bae0-52473c163c1a/76236503034.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 5356 bytes
SHA-256: c8dba5a22545a17b53153c5b5deb7f039212aadcdfaf9169dfa33196d873ad5f
font_01_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 11152 bytes
SHA-256: fb56bae4b6ecf66fea33c7c836bd759b6f4d291b6b565d38d69f01e127af8ded

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