Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1eafb1f62fe4af…

MALICIOUS

PDF

77.4 KB Created: 2021-03-29 01:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 602d816b6b1778ca5854b01add418dbe SHA-1: a2328848bdc50efed3b6d88249d02f1b28b551e8 SHA-256: 2f1eafb1f62fe4af6f5dbda269bd8d7a012657a52e55a5961d63d6aca352f3eb
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to numerous PDFs, suggesting a tactic to distribute malicious content or engage in phishing. The presence of embedded URLs further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=proform+980+cs+treadmill+manual
    • http://yourlivehelp.com/63883312325084zy.pdf
    • http://zotoxilob.getenjoyment.net/split_into_pages_online.pdf
    • http://peludofnor.fun/masimo_rad_8_finger_probew1zkm.pdf
    • https://wosuletoxo.weebly.com/uploads/1/3/0/7/130739711/768414326a943df.pdf
    • http://sellamorem.com/bildircin_yumurtasi_nin_faydalariddf95.pdf
    • http://siondez.ru/67843089712jl5t3.pdf
    • https://gipofomodofomew.weebly.com/uploads/1/3/2/3/132303323/873830.pdf
    • http://kajuzumanaz.sportsontheweb.net/59461057620.pdf
    • https://tupimala.weebly.com/uploads/1/3/4/9/134904604/wimakijor_bitonu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dejazuvorira/adobe_audition_editor_free.pdf
    • https://uploads.strikinglycdn.com/files/628b64b0-291e-4808-9a54-07d6076be803/gibegi.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/handloaders_data_sheet.pdf
    • https://s3.amazonaws.com/jebokizez/canadian_guidelines_for_hypertension_2018.pdf
    • https://s3.amazonaws.com/nefomojuwet/ridikisulelemolaj.pdf
    • https://uploads.strikinglycdn.com/files/bfa925a1-9181-4cf4-a7de-94af234528f0/68556602122.pdf
    • https://uploads.strikinglycdn.com/files/f941846b-e897-4d77-b1ca-19644ff0f27e/high_pointe_microwave_convection_oven_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/a519cff9-ecb6-4a05-9b00-53cb9e1298c1/vigikidevi.pdf
    • https://uploads.strikinglycdn.com/files/6a4af7a4-bf71-488e-ab27-db04b5f0ed6c/rizetarifi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9e.bin
3587f84c4e93f02baaae441b525053b12e4c8748416af1e33d66b055521b9bab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 5660 bytes
font_01_sfnt_off000100c2.bin
9779352254714e1c4756e2a31c2abaeb38390486a6bd34b0064bf78eefe45ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 11576 bytes

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