Malicious PDF — malware analysis report

Static analysis result for SHA-256 742f11b574266f1f…

MALICIOUS

PDF

71.1 KB Created: 2021-03-22 09:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85ce0c0dac4cd32183bd7d5772358dc8 SHA-1: 19d9830df9035509a27adce93f876b4b333640ca SHA-256: 742f11b574266f1f8854c25d7d5fe8644d8792937a9351be49ad8264aff05e5c
226 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to provide a password for an archive, a common tactic to evade static analysis. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vilenefex.ru/wix?keyword=craftsman+tractor+manual
    • http://negedibomul.sportsontheweb.net/95111798201.pdf
    • https://mabunamu.weebly.com/uploads/1/3/4/9/134902385/7610f2.pdf
    • http://rezonansmusic.com/86766878725i8ijf.pdf
    • http://bioforcecolumbia.site/77514341066inm9i.pdf
    • http://gukivuzijisuva.getenjoyment.net/cisco_wrt160n_default_password.pdf
    • http://sesizuxewewax.mygamesonline.org/lavekenasozof.pdf
    • http://jojidasusesot.sportsontheweb.net/aswamedham_poem_summary_in_malayalam.pdf
    • https://bunosepe.weebly.com/uploads/1/3/1/3/131379858/tolokosabameke.pdf
    • http://liberum.sportsontheweb.net/tumofixebapefidanefagipi.pdf
    • https://najatiwexit.weebly.com/uploads/1/3/4/0/134041182/xojosenilulome-doponunaj-nibosun-bujogexezopil.pdf
    • http://nupesupo.mypressonline.com/46422803975.pdf
    • http://inostrana.com/36907708960t21ku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_167cbe295dc245fb910ca7f67d2e1d3a.pdf?index=true
    • http://novogizeboje.myartsonline.com/cuantos_milimetros_tiene_una_pulgada_y_un_octavo.pdf
    • http://zorijefugixor.atwebpages.com/princess_diaries_2_cast_members.pdf
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_37f0e3b43f7c4ac591b8231f809c1028.pdf?index=true
    • https://87b076e5-2cd3-4f80-b59c-9a0ae19d836d.filesusr.com/ugd/c8683e_6215bdd65d5846eab819d64c796fa434.pdf?index=true
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_08bc11d3478447548b29f64db1f85cd2.pdf?index=true
    • 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_off0000d92b.bin
13924bf88b9fac32563bdc5442c1080f997537653ea6a14ccf3920f6a6ee0861		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 4932 bytes
font_01_sfnt_off0000e9d8.bin
239c0e6cb8c44aa0f2a7da7c1ac59804c434b76a194e70cfd5fed5376c137d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 10960 bytes

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