Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db9325e6b8ab0d9…

MALICIOUS

PDF

81.2 KB Created: 2021-03-08 11:00:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 01b28bef6303d2ae4d745827d10e250e SHA-1: 74739c0498fbc29288fe562105c0ab60e39399bf SHA-256: 4db9325e6b8ab0d9677d7b803432d4de5a75076c6a3766110f3dd147fae0f76f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to 'online movies tamil free', indicating a lure to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=online+movies+tamil++free PDF link annotation
    • https://jarufepijup.weebly.com/uploads/1/3/0/7/130776730/laludelufufose_fusaz.pdfIn PDF document text
    • https://jevoweli.weebly.com/uploads/1/3/5/9/135958856/cdff76660.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/3483801.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/ahfI9id/how_to_play_spider_solitaire_on_phone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_603544c5880f1.pdfIn PDF document text
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/nugitidanegul.pdfIn PDF document text
    • https://cdn.sqhk.co/xesoralo/DlDieji/46275605963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_600f1749e42c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_5fd16e9248b5d.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/gomegaxu.pdfIn PDF document text
    • https://dakubotamijez.weebly.com/uploads/1/3/2/7/132712147/39aafd54.pdfIn PDF document text
    • https://zanolidades.weebly.com/uploads/1/3/2/6/132695759/fowawituxofaxem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_6022dfc86e4bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_e97dbf1cddac4ad4863fa20576a2fedc.pdf?index=trueIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_ecaa266b0aed4a2f953bcb9045a04e7e.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_0d30f6dbc6294458b3d61e91d568fb62.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_c895249caf464d5f886a758e65be44a6.pdf?index=trueIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_5cce7673fe1643a29747e670d4bde910.pdf?index=trueIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_1e95d824ff82453f8246efb5b6ce4bed.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_809795c16479443293e63de6e7edb258.pdf?index=trueIn 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_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 5000 bytes
SHA-256: ce986e547e235fe43ccb3e5377d991ef03dd1ae47a8931af9a6393048149490d
font_01_sfnt_off0001139d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139D 10672 bytes
SHA-256: 55e22b24fa2151b7aa9ffe9659850488e93965e4fdcae94d7b23a577ab6241eb