Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1753c5896a2a82…

MALICIOUS

PDF

78.3 KB Created: 2021-04-07 17:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6040a59d76defd61d09d1b81ebe5eacb SHA-1: 92da5adb1a333d35ad4bdc333b977f2d8c5a842c SHA-256: ef1753c5896a2a827f241bf8f705f75a98d624e349c6cb5d60e2ca86bff33f4f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data T1059.007 JavaScript

The PDF contains numerous external links, many of which are part of a link farm, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_MFA_LURE' indicates the document is designed to harvest credentials or session tokens by mimicking MFA prompts. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign, likely using JavaScript for obfuscation or redirection.

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://baarspo.ru/123?utm_term=forane+22+safety+data+sheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381971/normal_5fe59645388f6.pdfIn PDF document text
    • http://lovechat24.club/771503860747suwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_6013e120845c9.pdfIn PDF document text
    • http://doucheapp.xyz/side_angle_side_congruence_worksheetywpz6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_6032140ed9759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_600f0f532ec2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459936/normal_5fe32c771525c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493890/normal_601af26c95911.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/rebesudanolo/what_is_meaning_of_measure_of_faith_in_romans_12_3.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/tedatexudiwasiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/lomadakojime.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/bodefanenifibuwokudur.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_ccb29497635b4de79be37ef8d4037428.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/modulosevawojer.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/beloved_toni_morrison_free_online_book.pdfIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_e6c2d6c9f9694b3da19da62903a69ce1.pdf?index=trueIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_0b1ea75eb479461e908568f5e3424c36.pdf?index=trueIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_a9b4563529994e9181f4f875eff1a1d5.pdf?index=trueIn 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_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 5152 bytes
SHA-256: 6409dbe3a0bb4c805d14038604d9342cf0c998f837b7736999ffaa9843ee5e77
font_01_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 10840 bytes
SHA-256: 82542bbccae5da500ca978b066683fa33cafe1271e62fc8195b8346ffedf2b23

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