Malicious PDF — malware analysis report

Static analysis result for SHA-256 73228f25d6d62bcb…

MALICIOUS

PDF

70.1 KB Created: 2020-11-23 22:05:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f5df15d8a2c92c7ad9257456134873eb SHA-1: 9bf169a390ebfd86b63daa572901d14521afe18f SHA-256: 73228f25d6d62bcbb8c34de50d3854ae14c969daeaabbad604021cb17b6f058b
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://trafficel.ru/strik?utm_term=ejemplos+de+sentido+figurado+y+liter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416153/normal_5f988b447f6c6.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/8363686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445550/normal_5fbbd670c3d5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5f96780326976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f875fae67bd1.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/a6aeee00-b7d8-49b8-a12e-5b96e5898808/punogebirajaluwobox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26257b1-2a51-47f7-8393-2a221f850fe2/a_chipmunk_christmas_vinyl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d7ad3d8-432e-402e-8c1b-6c669f041980/2423259334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4861e9c-fffa-43c3-ae82-891f02048aae/vexikenuzojejefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb7ba31-1c96-4656-9496-4e733ac35e85/87541651160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14942e43-8716-44a0-8e63-e329a791fdaa/pebame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d73e0a82-cf80-4cc8-8ea4-383a7089d349/59856664315.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/goxexubibixobupozabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d6b025-7bc5-47a2-ae89-e5dbcbcde4c6/tcl_roku_tv_overheating_message.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d4ec69-1db5-4ce1-b628-323fa7575509/59168542314.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_off0000d005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD005 5496 bytes
SHA-256: 2cb63078090b1edfae1f59c074a0bbdb1a224f0be114ca99565152aac837ebca
font_01_sfnt_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 12048 bytes
SHA-256: 6c54951417e4c095a56f9307fe2989795fda9c3a2871d5815aa8f9302d563f11

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