Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1681d1a30936c84…

MALICIOUS

PDF

71.6 KB Created: 2021-06-06 03:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45ff0568b71dba77533068fab47a903a SHA-1: 595bee98cdb76dd441dcb4679f77b1efc2fec41e SHA-256: e1681d1a30936c847da3102021a99f67478dcee04fae3aec1896a9beb6ee1ee5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to a potentially malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/pbw?utm_term=grade+4+maths+worksheets+division
    • https://cdn-cms.f-static.net/uploads/4449987/normal_60289752a2d16.pdf
    • https://cdn-cms.f-static.net/uploads/4458148/normal_605cc446161a4.pdf
    • https://cdn-cms.f-static.net/uploads/4491436/normal_5fd2e83970854.pdf
    • https://static.s123-cdn-static.com/uploads/4484156/normal_5fdf94c2f1c4d.pdf
    • https://cdn-cms.f-static.net/uploads/4496225/normal_60538667c1892.pdf
    • https://static.s123-cdn-static.com/uploads/4466662/normal_5fdd3377a603c.pdf
    • https://cdn-cms.f-static.net/uploads/4412588/normal_602b95db6a7bd.pdf
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/45d5f69.pdf
    • https://cdn-cms.f-static.net/uploads/4413578/normal_60bbfd7b494dc.pdf
    • https://rosufira.weebly.com/uploads/1/3/1/4/131408230/fobufofe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5567b468-df80-4d0b-a6cb-06b750d0dab3/rules_of_magic_synopsis.pdf
    • https://uploads.strikinglycdn.com/files/28906e3e-d4ab-4012-8dfa-b995b4c030cf/pujiwu.pdf
    • https://uploads.strikinglycdn.com/files/b67c5272-b533-4db9-ba53-4dd40d3b04c0/sewage_treatment_plant_flow_chart.pdf
    • https://uploads.strikinglycdn.com/files/9e557c95-34f1-4a53-8dd7-4ee64106bef5/what_is_a_short_communication.pdf
    • https://uploads.strikinglycdn.com/files/7668077c-b82c-448e-ba38-ff07d393d30e/dinopurepeleroku.pdf
    • https://uploads.strikinglycdn.com/files/b9756a4a-f17b-47a6-a201-0249d45af818/is_no_game_no_life_discontinued.pdf
    • https://uploads.strikinglycdn.com/files/fcfe13b8-5c70-4908-b05c-cd6512ad9866/masters_in_wildlife_conservation_us.pdf
    • https://uploads.strikinglycdn.com/files/0ba73f77-39af-4cb1-afc6-0974969da8b9/mixafatipilaluvewigim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc42.bin
b99d4d37f4b64f96024a1c9e265802ae6c78c453b07e6e00e8808cc3ea2df72d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 5368 bytes
font_01_sfnt_off0000ee78.bin
d2a4a5586e913b1f87ae732ea5c3861054e2480910ac2b9d1d2c998ccb0ac2e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 10144 bytes

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