Malicious PDF — malware analysis report

Static analysis result for SHA-256 35517639025c6633…

MALICIOUS

PDF

80.0 KB Created: 2021-05-11 14:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5242db85ba8b068b20442e3071c8e89d SHA-1: 0adaabe1b98308827512af7fbba8600a1103dd3e SHA-256: 35517639025c66335036af1e85d705b7843616f33a29db4f22e39cd58edfc602
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or redirecting users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/strik?utm_term=what+is+t+mobile+cellspot PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482623/normal_60043c44b7b5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_5fe8f2d050456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_602c12eb30a38.pdfIn PDF document text
    • https://sasozubavurak.weebly.com/uploads/1/3/4/8/134886198/vemim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491671/normal_5ff58d07ae1c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_6028ed51d85d7.pdfIn PDF document text
    • https://nugukijozagesek.weebly.com/uploads/1/3/0/7/130739433/ruxilulovuwasebekom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_606e03b81dd8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_6050d2e8dcaf1.pdfIn PDF document text
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/rewago.pdfIn PDF document text
    • http://fezibinuzot.iblogger.org/22354579359.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/3b8234201ae89.pdfIn PDF document text
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/lalisivisibi-tugavad-nabolu-lesixisorupepam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450040/normal_5fce58f3c32ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477877/normal_5ff5ef81ca7a8.pdfIn PDF document text
    • http://xusonawifofi.iblogger.org/92858379656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_602558770353e.pdfIn PDF document text
    • http://valezopifipob.22web.org/lopizixi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kalapifupedafog.epizy.com/83832527130.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/79708175408.pdfIn PDF document text
    • http://sadabodavezuzi.epizy.com/baxegelesuduxurozikax.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/7241244947.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/67022054842.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 5232 bytes
SHA-256: 88ee50ffa8c5d3fb1ac07f95cb96a74b324c1951e6a5ec3ea869a18f61b63c78
font_01_sfnt_off00010db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 10292 bytes
SHA-256: a349819505ed9c92d00f49439bf959cb4f37bf07f9614977c7d80c77dd34035b