Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5f8803f8e0cf5c…

MALICIOUS

PDF

64.0 KB Created: 2021-05-28 20:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 81fc8169a781a98438d0865648d6f65c SHA-1: bcc83400510526540f18ba11882da56addcb7061 SHA-256: 0f5f8803f8e0cf5c843aa77f38d5a08ded6fa0f37402fcd0d43ee876a9306681
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=install+ubuntu+linux+on+virtualbox+in+windows+7 PDF link annotation
    • https://nafuginanosuja.weebly.com/uploads/1/3/4/5/134598664/3531294.pdfIn PDF document text
    • https://zogujajuzeve.weebly.com/uploads/1/3/5/3/135392671/rabiputin-famejitafekoru-fuwujik-siregabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_606cc6f6d62d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447431/normal_600d4f3e73b33.pdfIn PDF document text
    • https://jivafizet.weebly.com/uploads/1/3/4/7/134743279/53033fe153335c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471690/normal_603629960c4af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_6026f9f1822dd.pdfIn PDF document text
    • https://zegadakupoxak.weebly.com/uploads/1/3/4/7/134749069/vuxerinur.pdfIn PDF document text
    • https://zunazodofi.weebly.com/uploads/1/3/4/6/134636935/xusurid.pdfIn PDF document text
    • https://rakovarirol.weebly.com/uploads/1/3/4/4/134458111/7225838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412891/normal_6064d2d3cfe10.pdfIn PDF document text
    • https://fudopelotavag.weebly.com/uploads/1/3/5/3/135325828/fekewejesudij.pdfIn PDF document text
    • https://panujiwawavila.weebly.com/uploads/1/3/4/4/134457592/mofov-bimokesegutafa-wokoluzupuf.pdfIn PDF document text
    • https://kapofered.weebly.com/uploads/1/3/2/6/132680839/9714968.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/2da110ae-9e12-41cb-b52f-a01b6ec3e8b5/char_broil_oil_less_turkey_fryer_minutes_per_pound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4f4585-3a64-469f-9b35-221fb804174c/prefixes_list_a_to_z.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b53ce3-ea17-41ab-b79d-5de90026af92/nexivepixos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00ecb6a6-9318-474f-88e7-3d17e72eafa4/54714041107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4514978b-a613-43eb-b3b9-353040380f64/paxowelokekodas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c3b4a26-b30d-4c6a-8d83-8f0dd6e18c3a/when_does_ros_myers_leaving_spooks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f68156-9542-4618-9c5e-00874b0db1bf/13136606228.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 5196 bytes
SHA-256: fc4d4ba40c032001ae723c350ab5a6207aba159c2897377a39696edf48d912a8

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