Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a015f751c6faf7…

MALICIOUS

PDF

85.1 KB Created: 2021-04-03 10:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 295c07da9d244a5bd5ccc22649ff4d0e SHA-1: 7e2036564f9dbd340c55968cd8167b0bf98e4dfa SHA-256: a3a015f751c6faf733ac999ffd320a343b27ebbbb0549e8a197f63b70c825dc1
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/123?utm_term=realm+browser+android+studio PDF link annotation
    • https://cdn.sqhk.co/pelopuxi/bj8oeTr/pikefabijetirulusim.pdfIn PDF document text
    • http://krokoboko3.xyz/panasonic_phone_model_kx-tga652_manualrbxsp.pdfIn PDF document text
    • https://cdn.sqhk.co/kemuxilajig/MjbianJ/90335698266.pdfIn PDF document text
    • http://yogist.fun/jesukiferuwizgyzr.pdfIn PDF document text
    • http://waliwosodumobu.iblogger.org/86642968465.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/how_to_reset_logitech_k400_plus_keyboard.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/19131841355.pdfIn PDF document text
    • http://tekirivira.iblogger.org/35130943503.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/dWgjLrB/telepathic_connection_with_friend.pdfIn PDF document text
    • http://subbellassecret.com/badofarunixijuwvqhe.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/69999451588.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepibugab.rf.gd/ecological_interactions_activity_student_handout_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de626891-cc1d-4e49-8930-918a5c944e83/nursing_theories_and_nursing_practice_4th_edition_smith.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_c30c7666b3664f9c8edc00dc706904f5.pdf?index=trueIn PDF document text
    • http://jenesigafepi.epizy.com/rukirijewotarule.pdfIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_ca1570dc4c9e4d30bd016e4d2d3243f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff1ab39d-ccae-4482-b166-451aac14fa9c/how_to_obtain_a_business_credit_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f09f87-1691-446e-ae80-86b16153c815/jusomubemo.pdfIn PDF document text
    • http://mewiwujudulixe.epizy.com/93154579445.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b245ad-f128-4751-a05d-ba2cce05deaa/monokubofirejeroxaf.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_e640ef26fa6842f1b3972df3b9635fc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd0946b-bb2f-4071-b688-906eea3ff6cf/1821731389.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_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 5212 bytes
SHA-256: 21341ac6a76857ae9e4e9b84a4291acaf1de696b81585c2df98685378ea93149
font_01_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00011f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F67 11588 bytes
SHA-256: 97b10821c404bbbab1dbd94ea8a420702b9017cb24719aa67da94a08ec9e5491