Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31d7d08e9967f65…

MALICIOUS

PDF

75.7 KB Created: 2021-04-02 00:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c8ae822dd609eb4201c70ce562e3dcca SHA-1: 5e018c4f38fb3ed28209c20ae4a1598c0fdc2767 SHA-256: e31d7d08e9967f65b587f2e71cf4e6e9dbcd77c8c8fd35a2fab7bab75cd9fcb3
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and a phishing lure, with a high ML score and ClamAV detection confirming maliciousness. The embedded URL 'https://zajinet.ru/123?utm_term=bearing+and+distance+pdf' is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains text related to 'bearing and distance pdf' and references wkhtmltopdf, suggesting a deceptive document.

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://zajinet.ru/123?utm_term=bearing+and+distance+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445118/normal_6015c220916a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_603e32e0efd47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5fedc51827670.pdfIn PDF document text
    • http://sifulodidikit.22web.org/rojatobomutezima.pdfIn PDF document text
    • http://yewes.space/90866579442ek0g9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454819/normal_5ff5764233d78.pdfIn PDF document text
    • http://coolmag.biz/gafebivoxizegjpih.pdfIn PDF document text
    • http://fsbsiod.com/25755022242n93ll.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490377/normal_60280863ceb0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474170/normal_6052da63d86cb.pdfIn PDF document text
    • http://cardioactiveufficiale.site/probability_ncert_class_9n7hdo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_603297918d6ef.pdfIn PDF document text
    • http://shimano-stradic.ru/5079152052g9kvj.pdfIn PDF document text
    • http://legendbilisim.com/how_to_unjam_insinkerator3uds2.pdfIn PDF document text
    • http://japancar-sib.ru/wusobujetuto92h52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_5fd30ca919e1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376127/normal_6000d6a093db3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rimamosapike.epizy.com/anorexia_2020.pdfIn PDF document text
    • http://naxokagad.epizy.com/silavuz.pdfIn PDF document text
    • http://vojemigami.rf.gd/iready_teacher_answer_key.pdfIn PDF document text
    • http://tujefozumuresul.epizy.com/19_ways_of_looking_at_wang_wei_summary.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_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 5340 bytes
SHA-256: 21a54547fe39f0f83e4329a7e47fa3094c448fe5725746df433fe5adfc4fd83b
font_01_sfnt_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 10548 bytes
SHA-256: 581ffc4df2543a3a4f6cb4386ca073a426cdcc7154f2c45b20057459a6adba38

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