Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5af0af293b8e0c4…

MALICIOUS

PDF

72.6 KB Created: 2021-03-10 10:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1382ce38d6968ed2b6d39720af2c1fa3 SHA-1: 597b4bc4b271dc3eb06aaa877962759db750b361 SHA-256: f5af0af293b8e0c49d66a39133373b4df9b59c025d2a26b1e3886d1f0c4fd5a7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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.
  • 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
  • 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://xajibur.ru/strik?utm_term=why+is+my+epson+printer+ink+not+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461766/normal_6019b2d649a6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422367/normal_6039a4662360f.pdfIn PDF document text
    • https://zujujoweb.weebly.com/uploads/1/3/5/2/135297083/jonimipafux_sixipikov.pdfIn PDF document text
    • https://vivexizakodol.weebly.com/uploads/1/3/1/4/131483194/000ad079a545864.pdfIn PDF document text
    • https://weromosamewose.weebly.com/uploads/1/3/4/2/134265498/bigibemux.pdfIn PDF document text
    • https://denuxikunoleluj.weebly.com/uploads/1/3/4/0/134018299/maxivamojepebakin.pdfIn PDF document text
    • https://voperupazekeko.weebly.com/uploads/1/3/4/5/134505312/funiso_pasaz_sigolidagodu.pdfIn PDF document text
    • https://fejigurize.weebly.com/uploads/1/3/4/5/134509658/simifonijez.pdfIn PDF document text
    • http://agent-ritual495.online/491327243250kbfb.pdfIn PDF document text
    • http://martakkord.ru/sigma_bicycle_computer_setup4fr1k.pdfIn PDF document text
    • https://zogugixuwomu.weebly.com/uploads/1/3/4/2/134234599/zenex.pdfIn PDF document text
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/fejexo-gabora-vegipasuvajexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_601b914d5ae42.pdfIn PDF document text
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/rofinekotepixam.pdfIn PDF document text
    • http://datingdate.site/overhead_door_legacy_model_696cd_b_manualuexih.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/samopakamefap/55448176075.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/short_case_study_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3481e581-9912-4d22-ae57-31f14c88170a/21788315988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56625da1-0248-4131-b828-c688299c1427/how_to_use_texas_instruments_ti-83_plus_for_statistics.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/vetiviwis.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_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 5260 bytes
SHA-256: c1c5a197f0233062e93a2432c13fc8577d7ade60f0ad7275097cb99f7eee6390
font_01_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 10184 bytes
SHA-256: b57b396e1e1d59279367baa22b323984123135fcf794c40b619309b8c1331bdc

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