Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7fb1d89b64b98d…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 12:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c7ce35b009eb32da8518edf392ab8503 SHA-1: 830a3877d1255e10e13e08f2393236f8ff806200 SHA-256: 7c7fb1d89b64b98db8aa3e64a9679a0dbc46b8d30b61982f0419d17d0a676991
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure itself is also flagged for being a link farm on disposable hosting, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=how+to+earn+pokecoins PDF link annotation
    • http://avtrak.ru/ckfinder/userfiles/files/30229137220.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/46396684940.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/19548234250.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/54886413135.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/49345397471.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161327863ee948---28776429231.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090411374867.pdfIn PDF document text
    • http://cpils.com/userfiles/file/manezovogokodav.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11182990273.pdfIn PDF document text
    • http://wenxuezj.com/images/File/8125372712.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/88736612037.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/21056859107.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/19900074202.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/47344480722.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/84424477513.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://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_off0000c70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70B 17692 bytes
SHA-256: 18842ff861cc2d01683159e4fb4b100614b5845ad164f382fef06466ac895373
font_01_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D61 10488 bytes
SHA-256: 01552c566f9f031721c3fc6df4d51e835999fcccce7d3adb9c7067c67d6a0f69

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