Malicious PDF — malware analysis report

Static analysis result for SHA-256 2270f9f08ed2ee89…

MALICIOUS

PDF

78.5 KB Created: 2021-04-01 13:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 857f8de38294472c702d644df0d1711f SHA-1: 58f96a380dbf64c53cfe0c352bd0e847c08049f8 SHA-256: 2270f9f08ed2ee89569dc681dc300cf8d69cc5778b09d5ada586dc32d44f7388
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://dugedepap.ru/123?utm_term=modul+brevet+pajak+a+dan+b+pdf PDF link annotation
    • https://cdn.sqhk.co/zowegifivufo/fhbjhl5/wunevonerujere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_60634dff25cd3.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/jebjhXo/mini_golf_cart_toy.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/hE17ywA/13252957679.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370288/normal_5fe394fa17bdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424341/normal_5fedd2367006a.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/hj5fgdS/star_trailer_design_your_own_hollywood_style_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480745/normal_5ffd22d515e66.pdfIn PDF document text
    • http://liropade.22web.org/7257593598.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468837/normal_600117ca97f12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_60328d10d99a8.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/hidQWqg/96006615152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_6015e1292ca18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_0939ed4327c04d5292271e47d7f8e53a.pdf?index=trueIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_f6ef9f4325c042e1bcd085d4416251db.pdf?index=trueIn PDF document text
    • https://aaf2f8d8-4593-4070-95c3-ed2308805076.filesusr.com/ugd/337eea_dbef7d7db36c465196bfcb7084917cd2.pdf?index=trueIn PDF document text
    • http://lesexugisitu.rf.gd/aisd_calendar_2020_18.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_c90d5a0d6f444f7aa86c442b0633981d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb522f5-795d-4804-8906-fb6a1a11fdb6/what_is_the_difference_between_nevertheless_and_however.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_02b1cc3dc9e24f6682f9303a392ee278.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/530babc4-e964-46b3-a8b6-edc3f681ea23/why_is_my_hp_scanner_scanning_in_black_and_white.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 5204 bytes
SHA-256: 2cd8ca7c1f1e43de729bb87979e104319e45a1cdfe9d8a2a77987324a2994ef2
font_01_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 1804 bytes
SHA-256: da182a4acbf76e48aea33efc838d76e43126d941b848b8a19592277a59e72f4e
font_02_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 10640 bytes
SHA-256: 34a1848a20786422d55505e4a0d436482abd37817e6c7752b7eeb9dd13d0390c