Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cffc164ec7f6ef2…

MALICIOUS

PDF

77.3 KB Created: 2021-03-23 07:20:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 72907116e39186bf63be6c529ae94b30 SHA-1: b6cbca48a24b7559ffad52836e5f241df02561a3 SHA-256: 0cffc164ec7f6ef2b0587a2fe7b47c7bdbefbbda45ea3cc0b45254d1e542e338
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of external links, with one pointing to 'https://maypoin.ru/award?keyword=support+vector+machine+matlab+pdf'. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. No scripts were extracted, but the structure suggests a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/award?keyword=support+vector+machine+matlab+pdf PDF link annotation
    • https://zujogomute.weebly.com/uploads/1/3/1/4/131483029/fapukudarezofoxogi.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/a590f3c940a0e.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/4195642.pdfIn PDF document text
    • https://varemajog.weebly.com/uploads/1/3/4/5/134585454/3975247.pdfIn PDF document text
    • https://riderasal.weebly.com/uploads/1/3/0/7/130738784/8545040.pdfIn PDF document text
    • https://jefogozadiz.weebly.com/uploads/1/3/4/0/134040800/a2774bf935f.pdfIn PDF document text
    • https://vukedezesul.weebly.com/uploads/1/3/0/7/130776134/4d38cde189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479718/normal_60282b845539a.pdfIn PDF document text
    • https://dowolozudatu.weebly.com/uploads/1/3/4/0/134000293/wakogusa.pdfIn PDF document text
    • https://taxajefikudo.weebly.com/uploads/1/3/4/7/134765143/ce85d7df.pdfIn PDF document text
    • https://vepenisa.weebly.com/uploads/1/3/4/3/134339982/nulapag.pdfIn PDF document text
    • https://vetazewufa.weebly.com/uploads/1/3/2/8/132814418/520179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_600f3be704d5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded6c0b2-6528-460e-ae3b-6606c01f542c/resumen_del_conde_lucanor_cuento_2.pdfIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_3ff64b488da74f8a861736e6e2fade30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa56fa2c-0a62-4e86-bf9a-83963291618d/glacier_bay_kitchen_faucet_spout_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f3582a-e6cd-48df-a638-6e0784dc4be8/what_are_all_the_harry_potter_movies_in_order_from_first_to_last.pdfIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_277d3722a1714218802c7a7d2402f081.pdf?index=trueIn PDF document text
    • https://8ea4a4fb-2859-49e6-8c89-66ed49166bb4.filesusr.com/ugd/0088c1_ad87b7da5b8a4169a169757ccc422b28.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae4bf6d-c752-49ee-940b-1d2e05e16de8/maxiwulesubapos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c75677-fa98-4ae7-9ab3-a11e47025788/possessive_nouns_worksheet_for_grade_3.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_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 5520 bytes
SHA-256: f09a2a82477d410eede4e97f1c87c8b5e0c2ea7d938a0d8d82e168292a4dbaff
font_01_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 11980 bytes
SHA-256: 757ac10bdab02190397da43932f933befe5168037efaeceb432b8f80237881b9

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