Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded73a66318668a3…

MALICIOUS

PDF

75.7 KB Created: 2021-03-02 13:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22f2a328a51dc7e1dfb8a66c06906415 SHA-1: 5ba62b4b6fb2421bd51fc8e76956dcd8ea51a834 SHA-256: ded73a66318668a367d6ed484bb6e147b5a9efa329716699942732bd2bdf72ae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards the document's primary function being to redirect users to malicious 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://mezovuduw.ru/award?keyword=what+is+the+point+of+a+security+guard+in+dubai
    • http://trenketo.buzz/psychological_testing_for_adhd_in_adults_online5o41d.pdf
    • https://fimopoki.weebly.com/uploads/1/3/4/0/134040487/pizumajo.pdf
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/nuwopobalas.pdf
    • http://justamorem.com/97761693622jzk1z.pdf
    • https://fofonamid.weebly.com/uploads/1/3/4/8/134869219/muzasukevebawokef.pdf
    • http://startbastar.online/sunbeam_water_cooler_parts_ylr2-5-90ch3xrdam.pdf
    • https://gasatuba.weebly.com/uploads/1/3/4/5/134596028/koniwudivatogo.pdf
    • https://static.s123-cdn-static.com/uploads/4448330/normal_5feafe63c5eab.pdf
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/kadelemeg-pukuw-dukusofirevaxe.pdf
    • http://letgtma.bid/15464964817eutwj.pdf
    • https://wiwovadale.weebly.com/uploads/1/3/5/3/135322143/7225169.pdf
    • https://mozesejute.weebly.com/uploads/1/3/1/3/131380505/29fd2f2c0116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bupujipa.epizy.com/whatsapp_for_win_10_free.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_off0000ec44.bin
6558d293a0de654a2a3e0f2269535f76b02335813f4785433320835994569b09
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 5640 bytes
font_01_sfnt_off0000ff80.bin
5cd01360605099f3adf9e5e811722ade03d5f4758a3167612fe6af137fc7215c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 10000 bytes