Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8574b74af4849e…

MALICIOUS

PDF

80.3 KB Created: 2021-03-20 09:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 36272f0810cb49e301c7b83b84d96d91 SHA-1: 32afe1424ad4403808eeb3f05609151ae1f3d12c SHA-256: 7d8574b74af4849e492bf937c80771a6e676bfc8c76df849b7d64ce8ab327697
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to "1000 basic english words pdf". The presence of numerous external URLs, including one pointing to `ponafet.ru`, strongly suggests this document is designed to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL findings point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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://ponafet.ru/award?keyword=1000+basic+english+words+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452837/normal_601db766bd174.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/ihYBaC7/58072251433.pdfIn PDF document text
    • http://save50.pro/pivuraxuzakapaxatuzemttmj.pdfIn PDF document text
    • https://bebekibuxa.weebly.com/uploads/1/3/5/9/135993907/186ca1556d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452161/normal_5fc9380edd1a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393188/normal_5ff1eda6988b9.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/gggcAji/43258709379.pdfIn PDF document text
    • https://loxogekero.weebly.com/uploads/1/3/4/0/134040689/109565.pdfIn PDF document text
    • http://olymptrade.buzz/44339390858spvk8.pdfIn PDF document text
    • http://byseles.xyz/zadunij8vkld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_600a67d2ed70f.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/rugekejovogubanekik.pdfIn PDF document text
    • https://nujujuzizupefe.weebly.com/uploads/1/3/1/6/131606206/tasejizirafeboru.pdfIn PDF document text
    • http://itdiscounts.info/audio_driver_for_windows_7_32_bit_intel_pentium_4e4xy5.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/fljjPia/52364208229.pdfIn PDF document text
    • http://cashthe.ru/jipevagosbq4.pdfIn PDF document text
    • http://dvigatel.guru/pizimavesasi3aa.pdfIn PDF document text
    • http://tomandbxof.site/best_free_ti_84_calculator_appuzqh2.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/iaIrl8Y/minecraft_new_world_craft_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f728281f-73ba-430b-bd08-7dc06a764e4b/gas_constant_r_for_air_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1664475-9be1-4c01-8232-a7f0a7142425/1999_suzuki_quadrunner_250_4x4_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/017f48d6-8379-45c4-bf74-f2b9222527cc/faulkner_barn_burning_theme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb9fed5-5109-4354-8e1e-2931fc11b937/bibatudafoxima.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_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 5748 bytes
SHA-256: 1ed9d291368a66a8d87f3772ef4748992f3600348f0c40802b036d5f18c75701
font_01_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 13200 bytes
SHA-256: df1d85d5498d9c128e83d1c6327800a9df7d21abc3f45aea48e792b0cef79fea

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