Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f62e770e3adbf1…

MALICIOUS

PDF

81.7 KB Created: 2021-03-19 09:59:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5edb7927f2bdeb3428b598bb9df6d5e3 SHA-1: 490ab900fe8934b85c53fa03dae80a1e48c3d8b8 SHA-256: 86f62e770e3adbf16f72d8531007a1c6a51ccb922aa042d00a849459109d599f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://seumenha.ru/award?keyword=behaviour+driven+development+pdf', is likely a lure to a phishing or malicious site. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=behaviour+driven+development+pdf
    • https://baxopaparoxiw.weebly.com/uploads/1/3/1/4/131454316/sojunawuzil_bokum_figat_jarubezak.pdf
    • https://niliwuwez.weebly.com/uploads/1/3/4/2/134265541/mogewe.pdf
    • https://cdn-cms.f-static.net/uploads/4472186/normal_601cdf40630c6.pdf
    • https://nodararikerat.weebly.com/uploads/1/3/4/8/134885074/1ba6a.pdf
    • https://static.s123-cdn-static.com/uploads/4368493/normal_5fc6ac44d8e2d.pdf
    • https://xixebume.weebly.com/uploads/1/3/0/9/130969831/nuwepa-finujuzetas-wenuvotitije.pdf
    • https://ludasajuwo.weebly.com/uploads/1/3/4/0/134096591/75c767.pdf
    • https://kixarazebeda.weebly.com/uploads/1/3/0/7/130776474/cd96fd.pdf
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/suwujixulimozejipam.pdf
    • https://xifalazixaxidig.weebly.com/uploads/1/3/0/8/130874217/funemo.pdf
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/1286045.pdf
    • https://kesiwupi.weebly.com/uploads/1/3/1/4/131407351/zosukuruno-duwefokex-vuridux.pdf
    • https://lajisoxe.weebly.com/uploads/1/3/4/4/134435468/2613e188150.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vesubodufisi/arkansas_driver_license_rules.pdf
    • https://s3.amazonaws.com/jemisajoda/tififagebuwowisu.pdf
    • http://nixewawomito.epizy.com/facebook_event_image_size_guide.pdf
    • https://s3.amazonaws.com/visagogijulep/ielts_speaking_samples_with_answers_band_7.pdf
    • https://s3.amazonaws.com/migivewuwe/bepijezanotuju.pdf
    • http://nuxumejaxumem.epizy.com/xelujidebu.pdf
    • https://s3.amazonaws.com/mizeteb/android_firewall_call_blocker.pdf
    • http://gagisejokunego.rf.gd/tuzalolowexiwewuwe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f708.bin
c5dd5de997b03c1f99eb87e70204bc6cfc4394502620d2858cd9521aa91ad3e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 5096 bytes
font_01_sfnt_off0001082d.bin
fce2f91c519df4677256e2cf7626c57563e2d6326230ebee2b89401247cca7d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 10304 bytes
font_02_sfnt_off00012b46.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B46 4324 bytes