Malicious PDF — malware analysis report

Static analysis result for SHA-256 637e807edb5984a8…

MALICIOUS

PDF

75.1 KB Created: 2021-03-27 11:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0cc5c3dc2ee8cb189ec8a282eda7a393 SHA-1: 750524c413b3cd781d7d8da2fad9cd8234d5a0b2 SHA-256: 637e807edb5984a8b05633eba4195fcfaff05f353ffab826c4b4b28dc03d7ffb
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, but the presence of multiple links to disposable hosting suggests a link farm designed to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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://yafferge.ru/award?keyword=precalculus+syllabus+pdf In PDF document text
    • http://probmake12.xyz/xasebugiqt8ni.pdfIn PDF document text
    • http://jumbochecker.com/72302290149wmarm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393647/normal_60390ebe6eaaa.pdfIn PDF document text
    • http://teplotronic.ru/basic_elements_of_musical_play_theatrejx2cl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445343/normal_5fffbd6019ee9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502721/normal_5fdcb5198a17a.pdfIn PDF document text
    • http://labincom-med.ru/how_to_increase_speed_on_2014_club_car_precedent20pqi.pdfIn PDF document text
    • http://carinsusa.com/muzusenupofomixarijuniv948a.pdfIn PDF document text
    • http://7lessons.site/integrate_sec2x_sec_xtanx9_2iag3p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5fd2d0059ae98.pdfIn PDF document text
    • http://kupiokno.su/the_complete_far_side_costco8z3lm.pdfIn PDF document text
    • http://vas-rem.ru/131785662411kq9t.pdfIn PDF document text
    • http://pe50off.info/how_to_increase_your_emotional_strength76f4a.pdfIn PDF document text
    • http://13millions-warzone.store/44259129322o0817.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziboporo.epizy.com/accident_investigation_report_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5cde7a-3188-4d2e-a793-a8bd5b0e0992/tivo_premiere_series_4_tuners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0675c7-6f33-4bfb-83e3-07d1895bcfa9/23302474109.pdfIn PDF document text
    • http://nofazixufewow.rf.gd/668626192.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_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 5392 bytes
SHA-256: 4860a90bc8d517e25b37f28d9b864e3991daf219e5e6f5549f6e44ed281e0ad0
font_01_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 11384 bytes
SHA-256: 7a80849384eb66651692f7fc2bcd3026c2c7ba1a01a79eb8653751e679e50608

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