Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d79abcf739520fe…

MALICIOUS

PDF

102.5 KB Created: 2021-03-27 19:20:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e3f004cf4d47dbf5ab40b99d2f57fab2 SHA-1: a2310c81b85e2fe21cbdbcd10508520dc8ae1349 SHA-256: 4d79abcf739520fead462ca2723926cca4b4f1800dc11c17096bb3beffb5ebe7
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a deliberate attempt to create a network of links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the primary attack pattern is the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/123?utm_term=pandora+box+story+pdf PDF link annotation
    • https://mibiduzomezo.weebly.com/uploads/1/3/5/3/135327428/5753334.pdfIn PDF document text
    • https://wuremuzagatixob.weebly.com/uploads/1/3/4/6/134612401/b0a8779b3c.pdfIn PDF document text
    • https://cdn.sqhk.co/numisezopo/92geC2n/zabazekoxugude.pdfIn PDF document text
    • https://cdn.sqhk.co/dubeminap/hhPwwcm/mumasiveranebarugi.pdfIn PDF document text
    • http://registrat.space/moxemipavitukigedumawew97ygb.pdfIn PDF document text
    • https://lajizifoposu.weebly.com/uploads/1/3/5/9/135958207/lolus-lowidikisekegex.pdfIn PDF document text
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/4d20dfa4afb5e9.pdfIn PDF document text
    • https://fuwamelewupo.weebly.com/uploads/1/3/4/1/134131589/e0cc4.pdfIn PDF document text
    • https://cdn.sqhk.co/pujimuxuja/sigiha5/nufezukotisowejojexugotur.pdfIn PDF document text
    • http://koolmaxt.online/wuvedogofot8poeb.pdfIn PDF document text
    • https://bugupomulu.weebly.com/uploads/1/3/5/3/135396692/budewejijivomitijij.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/degipenononono.pdfIn PDF document text
    • https://popaxeras.weebly.com/uploads/1/3/0/8/130814769/2204535.pdfIn PDF document text
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/nifudavevidewalopen.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/vemobututepekux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_482217214da64abb96dcf55261e16a7a.pdf?index=trueIn PDF document text
    • https://383fd46b-cc41-47b7-9379-19c19d7bb1fe.filesusr.com/ugd/81c43a_e68cce5208b447f388b0b8de40b0bc9a.pdf?index=trueIn PDF document text
    • https://aa4a64a1-c69a-4176-9ab9-82648dcabbba.filesusr.com/ugd/70701b_2ccf9dae6e2f48b48b20731e59e068c9.pdf?index=trueIn PDF document text
    • https://d85b1738-a471-4043-b59e-116b2bb794a3.filesusr.com/ugd/97927e_569b92a41cd04e1282ed03051eea50a2.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_b4d25edbb4614a3db97a3c9460c6c86c.pdf?index=trueIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_e74472b026b84796aa13986fd9feeb86.pdf?index=trueIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_735e541799b849f1b8f04b2864bb7426.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_off00014dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAD 5312 bytes
SHA-256: 5ca9343a2344e1f664fbc7a656dd59c22a13048172531c59e8cb591627913b6b
font_01_sfnt_off00015fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD3 14220 bytes
SHA-256: 42180b7e02cb17cdee70ba356d45f336c53d0279439f56ea243ecd47a74c5eef