Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c1976c7492dc4b…

MALICIOUS

PDF

83.8 KB Created: 2021-04-24 13:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a6f283a7b4a1c53ca55ef529b8e40707 SHA-1: 3c9a0c6f8960c72a9ce7dc522ddb6b354399ee6c SHA-256: 79c1976c7492dc4b50073d859a11b4a275889dc711a484d8dc5e98f9135df296
156 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. The presence of a PDF link farm heuristic, along with numerous external URLs, suggests the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content-distribution attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 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.
  • 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://bologen.ru/strik?utm_term=how+to+clean+chlorine+generator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423137/normal_6038e2d65a894.pdfIn PDF document text
    • https://cdn.sqhk.co/femokuxajuz/dnonehh/come_avere_skin_gratis_su_among_us_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/faruzikako/SrXTYgd/xuxaruzamodekanaxefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404983/normal_6068b66a2f83a.pdfIn PDF document text
    • https://lolovegadagofi.weebly.com/uploads/1/3/1/6/131636941/roduvuratemov-rarotuziwuni-xewololew.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/nupebemex-webijogaka-wevawizozomaze-xasevagojas.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/cU9jhJT/64401857689.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/Yyicihg/autonics_panel_meter.pdfIn PDF document text
    • https://penixosifa.weebly.com/uploads/1/3/1/4/131482878/e8ed8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468274/normal_5fe72f590fd59.pdfIn PDF document text
    • https://cdn.sqhk.co/sorifalemuj/Pjeq2jf/donkey_kong_64_skip_intro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_759bb6653d444a7d920aae55017930d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/99726963861.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/luther_vandross_apologize.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/coliform_test_for_water_quality.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/39837925867.pdfIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_ee128b7aea434e18a75c4a906476a210.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dekogamik/all_barbell_exercises.pdfIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_7b3c335cd6cb42c08e47f6d66ef2159b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/15713199295.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_cd00c5b6c9014c499e5849d75802e048.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/ieee_research_paper_template.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/sesovodumotewupised.pdfIn PDF document text
    • https://f0ded7c6-1882-44c2-b580-3fd8daacf182.filesusr.com/ugd/1cd4ca_f0ea4c661e224c308a83757353eabc16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejados/70279770175.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/83539085036.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_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 4936 bytes
SHA-256: 8e98156d339b2b14066450afbd602b34d2da43d94eaef44dfbf8b4037761b757
font_01_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 11272 bytes
SHA-256: 07f9d1d42f77983dd8f42656151f963f5c86c25e0c64cb9550a69870feee905a

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