Malicious PDF — malware analysis report

Static analysis result for SHA-256 7935379a5c7b2803…

MALICIOUS

PDF

72.0 KB Created: 2020-11-17 03:55:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4549ef081b72c80dd61e07161e25af90 SHA-1: da68c901eeb9c55668f90b864d781d9c89596f6d SHA-256: 7935379a5c7b280375c9b0181cc30aefc597ede455aaae8c45510086c54e5de4
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 0.9998

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://trafffi.ru/123?utm_term=everything%2527s+an+argument+8th+edition+pdf PDF link annotation
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/kezupukono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_5fad99333b3f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417049/normal_5f9a6f4573f62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416666/normal_5fafc069a9709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_5fa736bd397ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3a375bf5-e8a3-4dd3-91b3-8b7118f93fa3/subnautica_cant_find_magnetite.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/92078064795.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/wutiwutixolimaz.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/list_of_most_common_adjectives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecb6150-c28c-404e-97d5-e7f359157412/damejawobo.pdfIn PDF document text
    • https://s3.amazonaws.com/fulomufimikim/6487937243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21322e48-add0-4780-9d24-cf7f7cd9bf81/sawone.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/frayer_model_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE6 5652 bytes
SHA-256: 718f62cd65094c28465c392134e21120a4e746510b6f04a29966dbb31db6c061
font_01_sfnt_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 10972 bytes
SHA-256: 76c1f867d4c93a9886c97142d231e41773e654da324f763c1cceab54cc2a35c0
font_02_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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