Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b8caf60631baf4…

MALICIOUS

PDF

82.1 KB Created: 2021-04-17 18:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e94b0e69babe9c03f4159eacffb57d3c SHA-1: b0e0a25bba81baa12f5b748085494bd96661831b SHA-256: b1b8caf60631baf4ab54beab0742d2a069c50092a152454b8089e0bf123524d2
156 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 0.9996

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://pelibifir.ru/strik?utm_term=what+salary+is+considered+working+class PDF link annotation
    • https://vupolape.weebly.com/uploads/1/3/4/7/134749420/tafavin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497368/normal_60344c2630e85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_60485a40badb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378381/normal_60523508169c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_602796c214b15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_601a30eaccf7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482617/normal_602e487ab69e0.pdfIn PDF document text
    • https://xemiwiwoxotewa.weebly.com/uploads/1/3/5/3/135325065/sivobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_600dde947c1f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469626/normal_60357365eed59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476427/normal_5fc9607b52354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444351/normal_60542b61dec7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492573/normal_6019ad7d4d66b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_604ff1ab77cc7.pdfIn PDF document text
    • https://xiligori.weebly.com/uploads/1/3/1/4/131411896/7527756.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/42b1c28f-1c2c-4d23-8bd7-6a2fe0f95bb6/the_law_of_conservation_of_energy_worksheet_answers_cstephenmurray.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/535cc026-bedf-4ff7-87a4-0a6b48afb32a/42_laws_of_power_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10de16bd-d20a-45f7-8f96-2a24a995c283/94393101384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97355a96-0700-40bc-80cd-26b41da620f9/breville_bov800xl_price.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/tawegutapa.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/what_qualifications_do_you_need_to_be_a_vet_assistant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25834717-1d7f-41d7-bfb2-07dbe1acd548/proform_xp_crosswalk_580_treadmill_manual.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 5472 bytes
SHA-256: 4c6b3d2f748e1553aae5afc75cc0e4400cc731b40b0fa9e84b3cf49120febb36
font_01_sfnt_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 12604 bytes
SHA-256: 5d7ed6d6748c1d9ff7bfae7460b194de1ee6e1e705a405723becfba73062e59a

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