Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d31df68c682067b…

MALICIOUS

PDF

119.4 KB Created: 2021-05-04 08:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: cc49b755d421c2a3fe6acaa66c64527d SHA-1: 40f2ca6c72e37ddb38d9cd6e401cb0aaaf40284f SHA-256: 3d31df68c682067bd3046440962f2e1c6a519e59f8a68dca3026448c50f417fd
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs point to potentially malicious content, and the document's structure is indicative of SEO spam or a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/strik?utm_term=can+you+go+to+jail+for+shooting+a+bald+eagle PDF link annotation
    • http://gafuvufafokujop.sportsontheweb.net/61702194745.pdfIn PDF document text
    • https://cdn.sqhk.co/wazewiput/iefhehb/mituge.pdfIn PDF document text
    • http://goldotzyv.ru/3_year_old_milestones_canadagjz8s.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/iBMtjaQ/kuwov.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/jfgfoDd/movie_making_software_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_602d02c07dc94.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/aNhaqie/sasabe_movie_material_store.pdfIn PDF document text
    • http://hardcreditcheck.info/criminal_justice_attorney_meaningp31f0.pdfIn PDF document text
    • http://spain50off.info/is_ls_prepost_freetkifm.pdfIn PDF document text
    • http://usblighter24.site/951250653489x78d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447267/normal_6004603ee3d3e.pdfIn PDF document text
    • http://rodina38.ru/wefulagaxajuvazatebfhwna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_601f07851fd09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_602ed9240e8af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/2335322582.pdfIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_7ceaf2e829864e668df4cc7a8a7f5ca3.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_e9f80881a70041ba9c41d8b267d5dd6d.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_a0c231c2a31e499cb380fd4746c9aee5.pdf?index=trueIn PDF document text
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_12f3a28529a14d6f8d529cde46d81348.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/maintenance_and_reliability_engineering_online_course.pdfIn PDF document text
    • http://jigisasamupor.onlinewebshop.net/jalir.pdfIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_e84530c62a0246f7a6934f06aaa320e3.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_off000192cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192CB 5392 bytes
SHA-256: e34668b7778f00a0590c7bf7a79e14f7dd97a5f58b453bf9b4a4b085d243c351
font_01_sfnt_off0001a528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A528 12476 bytes
SHA-256: 6c0e708a58b7c8b53dc4434a2b17dea1dda9006178a4664efb07a2fc315458df