Malicious PDF — malware analysis report

Static analysis result for SHA-256 581fbf145a8316b4…

MALICIOUS

PDF

41.5 KB Created: 2021-03-18 07:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0efcac2438ad0ef94b830063a906c53d SHA-1: 0d67f13c1f8a951a7985f52140e123df7107559d SHA-256: 581fbf145a8316b47dafaf04a7ed7a99ec735aaa1c2b82b55d12171ccf51a4b1
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9097

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 41 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://botokaw.ru/award?keyword=human+centered+design+pdf PDF link annotation
    • https://zexorekimapuwip.weebly.com/uploads/1/3/4/7/134702453/3752414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470391/normal_6020bd4e3fdb1.pdfIn PDF document text
    • https://cdn.sqhk.co/kukelagalefe/Ifjche4/gumball_tree_ornaments.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/pjgu1Em/tabedorofudig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_603e811338413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_602ee4bebfe9a.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/f6Gjjgj/english_grammar_worksheets_for_grade_1.pdfIn PDF document text
    • https://pitefomut.weebly.com/uploads/1/3/2/6/132682610/semoxamuged.pdfIn PDF document text
    • https://mebotorafegamor.weebly.com/uploads/1/3/0/7/130739377/pijipanero.pdfIn PDF document text
    • https://xoretewajojuso.weebly.com/uploads/1/3/4/4/134474148/f4209837d9c61e4.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/jungle_adventure_game_apkpure.pdfIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_b625d9ba21ed4ade8025861a58f62a3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasutiz/19832555175.pdfIn PDF document text
    • https://359ea524-acbf-40a7-8d58-ee96a8f10bc8.filesusr.com/ugd/ca2e76_7d9c830ea7054d1ab69dc476bd047147.pdf?index=trueIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_6a77c147445a4704988903f9b2c321c5.pdf?index=trueIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_55be041dbd4e49deac7bc45e64eb4365.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokit/13521243538.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/subabojogetogido.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_f21b290a594541a2a97450d3981f4089.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_0e5371c16ae54c83811d97ae7febf867.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_da6cb739535c49a7a6064f39d0f8d918.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vutame/27002_iso_2013.pdfIn PDF document text

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