Malicious PDF — malware analysis report

Static analysis result for SHA-256 40618f7f8e44ef2a…

MALICIOUS

PDF

99.2 KB Created: 2021-03-30 00:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f773b5b94c8acf24e65a950c46126b59 SHA-1: 10e9f23b14280926d438c478a6e8c4f81397a073 SHA-256: 40618f7f8e44ef2a4ee311aa1b8ddffd8f67d68a7966873495ac1e4602313070
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate maliciousness. While no explicit script was found, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/award?keyword=warhammer+betrayer+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491687/normal_5ffc04b21e610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_6019334c3758e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419650/normal_5ff2e548f09dd.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/puretulenuza/definition_of_alternative_dispute_resolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdcac965-da55-4a44-9509-1bc1c10100f3/ryobi_15-amp_10_in._sliding_miter_saw_with_laser_review.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/61997999713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e5df2e6-432d-4790-ac28-031968e27418/revolution_2020_full_movie.pdfIn PDF document text
    • https://7d33af4c-acfd-4996-9436-348e89828b5b.filesusr.com/ugd/289672_84dfe7f3571c49faaa724a518dfbd838.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/lesuzuweniriwuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/timubezomowukarolekesi.pdfIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_a45b02c22a414164975c01a41f8fae14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/deaac6db-bcc6-4ff9-b008-db661b364a02/lg_60uf7700_remote_control.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/dota2_ability_draft_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/19676043708.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/andhra_pradesh_state_formation_day.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/63011797267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a71180-e4ae-43af-9ae6-70f4222376c8/dikarumuvazukelutisekuvob.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/bofitipizi.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/fanamofuz.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_off00014a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A43 5324 bytes
SHA-256: 3e5636f2cb997fe9844882e3192bd6c4669d1c303820d4d11c01463b00e8eebb
font_01_sfnt_off00015c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C45 10592 bytes
SHA-256: c80ab034e22193adfe89bfd179a2e9249bb067c0faa9cc46b973cb6ed1a9b8f0

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