Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a16ee781eea9eff…

MALICIOUS

PDF

74.3 KB Created: 2021-04-02 20:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9a7e948f6539632290b8fc9a623e0308 SHA-1: e28ad5330ace5e59f834fada4a15e1d962d7785b SHA-256: 1a16ee781eea9eff6e2dc196905719dabac311041239c0e4d5c6f6af83b9121e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan delivery. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM confirms the suspicious nature of the embedded links.

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/strik?utm_term=electrical+engineering+jobs+in+tamilnadu+government PDF link annotation
    • https://cdn.sqhk.co/goluxewimabu/ghjjZcU/real_steel_boxing_champions.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/jbiaRjf/moto_mechanic_simulator_apk.pdfIn PDF document text
    • http://sazasebum.iblogger.org/waxepamaximab.pdfIn PDF document text
    • http://wisopenudaris.22web.org/how_to_empty_black_and_decker_lithium_hand_vacuum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5fe9296bec458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_604f5681b902a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412905/normal_600f220d9b5db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447914/normal_5fe531f589c2a.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/Z0ja9ib/6226394736.pdfIn PDF document text
    • http://fomilurap.iblogger.org/dupekaduzavur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_6054dc1d7c430.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_f774199b632c4078ba3bdaf7fa1bb363.pdf?index=trueIn PDF document text
    • http://vagakidid.epizy.com/quantitative_aptitude_syllabus_for_ibps_po.pdfIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_bc240516b27d46dc9f31c75e5bb3845a.pdf?index=trueIn PDF document text
    • http://luvojidepezepag.epizy.com/brown_platform_sandals_outfit.pdfIn PDF document text
    • http://vuremekewema.rf.gd/song_of_solomon_chapter_2_verse_3_meaning.pdfIn PDF document text
    • http://butomepa.rf.gd/55767777188.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_ae2bd4e53dde462fb35ceaaab7b3a103.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_45e7910823bf40aeb437f408bb36d486.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_e55299b004c04a25a0d0a752cb010a7d.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_4022d209f1f142a1bf2dc870d7ffe903.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_aeb1a8878f0547ae86d8e0f214c0a46d.pdf?index=trueIn 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_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 5492 bytes
SHA-256: 60cfe0b3daa120561531040e0dbfdf279f12526caa56709ab482e0c5bcfd9a70
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 9988 bytes
SHA-256: 4b13ae619941e44d9b7a37036e552c578ba9867aca23276cc0f17942dd2851dd

Open this report in the interactive analyzer, or submit your own file for analysis.