Malicious PDF — malware analysis report

Static analysis result for SHA-256 3212375a98ba3c77…

MALICIOUS

PDF

73.7 KB Created: 2020-12-17 06:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c65b52aa96cb909b4411d8c13fb3cc00 SHA-1: e8a32c53e445eb9bc5b5f3fc6450832f9822b586 SHA-256: 3212375a98ba3c779787efba0e8a4a0930e1b4ac0704fee1cf3cfd2213432382
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'traffmen.ru'. It also exhibits a PDF link farm heuristic, indicating a large number of external links, with one pointing to 'uploads.strikinglycdn.com'. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=adrienne+maloof+steve+marks+jr In PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/153577.pdfIn PDF document text
    • https://zopavuro.weebly.com/uploads/1/3/4/5/134584556/vetor_zezigewute.pdfIn PDF document text
    • https://ninijaliwejito.weebly.com/uploads/1/3/4/3/134350726/2405580.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/xawidexivedewek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa3c6090-754a-493b-87a9-18ea245fae02/19567563486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a9bf630-90b4-49e4-b0f1-74e5f61992c2/mcdonalds_steak_egg_and_cheese_bagel_copycat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7baabbe3-dcc6-485d-a7fa-9556b62107fa/dedefivalodek.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/lenejolexuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/pudejipisenut.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/95517279533.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/why_did_spanish_missions_fail_in_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/jarvan_iv_guide_s9.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/sushi_monster_math.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa82dac5-634e-4a98-90f6-bae6a48f323c/free_mandala_colouring_pages_for_adults.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_off0000cad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD2 5244 bytes
SHA-256: 763f0abc54ace941ecf136491891cd67cc157cdc3413f381ee347bc546c3761d
font_01_sfnt_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 11032 bytes
SHA-256: af3e437edc0b0bbee82a63212cc9206aa4d56f7fc6623d7b6426172b87e48a66
font_02_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16364 bytes
SHA-256: 656715a32156dadbb23107c1c47256491d80ae9ca8565cf3e41c978db5d17779

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