Malicious PDF — malware analysis report

Static analysis result for SHA-256 925c74e93ce4db3f…

MALICIOUS

PDF

84.1 KB Created: 2020-11-12 15:46:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ab899f7d04225774184e52303d9fb0b8 SHA-1: d9cf04e26f3093844f3d467b83d651643db88189 SHA-256: 925c74e93ce4db3faee4f2fc364d6adeb479171d57d3af64ac3e6ebf91190307
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 0.9997

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://trafftec.ru/123?utm_term=homework+in+japanese+hiragana PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420915/normal_5f96ca4f38afe.pdfIn PDF document text
    • https://xisifogobodi.weebly.com/uploads/1/3/4/7/134735845/jezusepafuzi_mejowoninexete_dudukeveluxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467581/normal_5fa7cc256d5bd.pdfIn PDF document text
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/2175866.pdfIn PDF document text
    • https://kigefewapese.weebly.com/uploads/1/3/4/5/134528385/3ac2c59.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/wuxifabasogamorodugo.pdfIn PDF document text
    • https://davijoxo.weebly.com/uploads/1/3/4/3/134357566/vupedije-vizebavujaleju-buvubamevosifok-nowosupaji.pdfIn PDF document text
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/87687d6.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/nagev/65191362584.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/96925052322.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/me_talk_pretty_one_day_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/sangamon_county_tax_parcel_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f1698f-99e8-405f-8cf8-527ba50360b5/kenot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3D 14760 bytes
SHA-256: 0719e4e77a61d20901ab1b4e6af68aaeb0faca168d530c5447072d41b5853f4a
font_01_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 5396 bytes
SHA-256: aa732285921386f03c43cb90539ea98cf9b2829206325f135b6fd8f027748450
font_02_sfnt_off0001106e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 16396 bytes
SHA-256: fcdca58077faa0479d62d06062685220f100a42ed4e69d9a91d08c8c582ef009

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