Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c3434bd9da4341…

MALICIOUS

PDF

74.7 KB Created: 2021-06-13 01:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 049677ff3eccde28146c6e8b3b13d1c9 SHA-1: c6f5c0f56c2a02b47e7b589b99634c9fd349f783 SHA-256: 24c3434bd9da43418370ab8c2ec2848ca9a0a7dfd405a48486491b507c5f7010
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself is used to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://catamma.ru/pbw?utm_term=na+ja+na+ja+mp3+song+download+djpunjab
    • https://talogaxuzule.weebly.com/uploads/1/3/4/5/134596774/tajilijudiv-figel-xezizuv.pdf
    • https://static.s123-cdn-static-d.com/uploads/4409619/normal_60b71d057f493.pdf
    • https://surutadalonuta.weebly.com/uploads/1/3/1/4/131455158/virezuzenovuxevumiv.pdf
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/duzusomuwo.pdf
    • https://cdn-cms.f-static.net/uploads/4383156/normal_602be58965f88.pdf
    • https://zidodorisud.weebly.com/uploads/1/3/4/3/134305305/ripija.pdf
    • https://sixumegeb.weebly.com/uploads/1/3/4/4/134476160/8599398.pdf
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/6964118.pdf
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/77d349a67dacc41.pdf
    • https://static.s123-cdn-static.com/uploads/4449783/normal_5ffd1c55d64d6.pdf
    • https://juvikawupuw.weebly.com/uploads/1/3/1/4/131409017/bofeze.pdf
    • https://dazuzidasepod.weebly.com/uploads/1/3/2/6/132681566/zerimetuxesudagi.pdf
    • https://gakezepatirana.weebly.com/uploads/1/3/2/7/132712251/f19c9d65d.pdf
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/gexiloterewa.pdf
    • https://tugojomabam.weebly.com/uploads/1/3/4/5/134588125/kumikux_letuvipozixisit_dozebofeg_lepikagumejuve.pdf
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/3218660.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://numefen.pbworks.com/f/virginia_real_id_appointment.pdf
    • http://masawumel.pbworks.com/f/colorado_state_tax_form_w_4_2020.pdf
    • http://xigikegom.pbworks.com/w/file/fetch/145124559/50666982406.pdf
    • http://fuxedemama.pbworks.com/f/kuperoluzodeporulowumim.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_off0000e5cb.bin
69561ed79daea83dcce0bfd85102c1ea2266286566812a22af1a42b23f1b68b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 5624 bytes
font_01_sfnt_off0000f8f1.bin
26a9fe74672086d6650c0c35bf9fe9f389b9ce4559cc70fc9c24ba4fe3ae9bd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 10772 bytes

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