Malicious PDF — malware analysis report

Static analysis result for SHA-256 853cf80e22323183…

MALICIOUS

PDF

77.0 KB Created: 2021-03-04 23:07:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6158ada2839ff659e1754e1e256ca0d9 SHA-1: 231d28aa999baeacb1d61b79a9e9c9e4da738367 SHA-256: 853cf80e223231832e09a8ffb63220a5055c9437794334f639734ee0dec54949
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other domains, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://baarspo.ru/123?utm_term=how+to+start+a+science+fiction+novel', is directly embedded. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=how+to+start+a+science+fiction+novel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460983/normal_600e7b4acc1a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471082/normal_600047c761635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_5fe8c9154599b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_601b2976e956e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448343/normal_5fc5e566716ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464870/normal_5fc8ffb4844db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369316/normal_5fca863c6fb2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420748/normal_60311323c0ee4.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/jukoxisojow/vunupagapod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0aa8086-a7eb-4f7b-a3c7-fbbe125a1d7c/47716818276.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/where_is_the_navy_seal_base_in_virginia.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/google_sheet_android_shortcut.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/future_fight_new_shadowland_guide_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5c90da-e8d7-452a-86f3-ca03a834b979/37317459692.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/game_naruto_shippuden_apk_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/31368817571.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_5d988e0c04564e52a8ff26b041d1500b.pdf?index=trueIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_868e3a9d4f6c494e91400d0b3350da8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gudukupir/fefidamemewigetazukozi.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_a0fed8837c9748ffbdc54f5d916bb684.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gozifep/jigerakinopisumixelodorab.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/product_experience_management_for_dummies.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_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 4988 bytes
SHA-256: 1e996b08369c5c3134d5c5f93023d2da14f7c08b740f4acb0f6bb9ad3f2d398c
font_01_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 10256 bytes
SHA-256: 9367a4dfdf5cae52b5f70d1ddba4f8573e3e4583bdc4ca9ea691c7d92b2f7d7c

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