Malicious PDF — malware analysis report

Static analysis result for SHA-256 73db492e0408ec81…

MALICIOUS

PDF

57.0 KB Created: 2020-12-16 02:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ead9d08eb1622d6f36e592d5231494d8 SHA-1: e5d39f163b122ad2fbb8593b9c6191363764d289 SHA-256: 73db492e0408ec81d469e9cb67c8d3ecb6eeb6468eaca7ee5efbca03dcfc78d4
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to a suspicious domain 'trafffi.ru' that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/123?utm_term=hojas+de+oto%25C3%25B1o PDF link annotation
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/704b47e98.pdfIn PDF document text
    • https://lubuminovek.weebly.com/uploads/1/3/4/5/134590555/raruvelezijexalidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482219/normal_5fb81d5ef4149.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/xekena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_5fb9274da4ed1.pdfIn PDF document text
    • https://lekomuge.weebly.com/uploads/1/3/4/7/134773229/7075269.pdfIn PDF document text
    • https://bepopasexib.weebly.com/uploads/1/3/4/3/134356469/50e855.pdfIn PDF document text
    • https://sawuraba.weebly.com/uploads/1/3/4/7/134720576/2bf9137f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf496f173fb5383b985567/1606371695821/57623721229.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36408403f5353fda5a38e/t/5fcb2ae71880ce05e8469236/1607150312843/american_gods_shadow_moon_is_he_a_god.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2be63405d5340f3359679/t/5fc4eaa561e25426e1d22a49/1606740645281/fifa_15_cheat_code.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc677faff13940aa265cd26/t/5fcc922da87f9f1b19d3a101/1607242285752/kifokerawoxumanuk.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_off0000a7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7CA 4940 bytes
SHA-256: cf742c5b651e69b3d968458f5ed2c4648df2f2e9113d02acc2f398c1da90b22e
font_01_sfnt_off0000b864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB864 9312 bytes
SHA-256: d3a9cd39cc153a7907148c41be22fd4654879458a7eccc3def6876620cf68c8b

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