Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84bdae12491838c…

MALICIOUS

PDF

66.0 KB Created: 2020-11-09 17:57:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8f882bcdc4a2d540059855ffcb12b161 SHA-1: 21c146b369cc947b435b0b451abbae8febac5ce7 SHA-256: f84bdae12491838c27eb4f3bcb1754ff15bdf019b9f7d632bbb142504eba7a13
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-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.
  • 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://traffset.ru/strik?keyword=hellboy+movie+hd PDF link annotation
    • https://nimimemuxigu.weebly.com/uploads/1/3/4/4/134488465/vubirimupujogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_5fa907cff06df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5f9e353e2f563.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/xefafimofaxeparekuji.pdfIn PDF document text
    • https://firupewuvub.weebly.com/uploads/1/3/4/3/134330425/6197399.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/legenapi/matthew_coleman_tpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f78d861b-ca16-4d4a-ac32-b11e1d6df67d/91597709084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d859f71d-f6f1-4455-9a54-65025381e25e/293745966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d777d40b-2821-4b57-aaff-539b59373d91/wefojixojofeminevokavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55134c38-3e48-4901-ac45-6e92d5545e70/57559406901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b26a293-1f32-425f-9c95-5850a28ef8ce/bejusivuvubutukuxuketurex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96a56d45-c84a-4d14-b3e6-46547de48cd7/rocksteady_xs_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FA 4844 bytes
SHA-256: 8247f416a85a55ae27bb149a6dca4d76a592fedbc20ab2139ef5f38dfec3383b
font_01_sfnt_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 10264 bytes
SHA-256: a2fb2ac64d222e982b170ff813b29770b6ac8b18f3829a38e34fc396a441443b

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