Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67ab996784f0677…

MALICIOUS

PDF

80.4 KB Created: 2021-03-31 09:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee9969d22fb2aec89876dd49a5e34f59 SHA-1: 2af10919126a8edc7ffb08456ed19285a7ff7778 SHA-256: f67ab996784f0677ecfe3ed87a37dcda4f822642d120fb08e6c6c8ff75b923c6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point towards a social engineering attack.

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://jumiwimov.ru/wix?keyword=t-fal+ultimate+ez+clean+pro+deep+fryer+parts
    • http://bawilidow.mypressonline.com/dowifoji.pdf
    • https://cdn-cms.f-static.net/uploads/4365635/normal_6016d2601281b.pdf
    • http://ximikilanad.22web.org/82759097506.pdf
    • https://cdn.sqhk.co/tisewesir/jflYjhr/fesolamubed.pdf
    • https://static.s123-cdn-static.com/uploads/4451363/normal_5fde1be388da6.pdf
    • https://rijomedoniki.weebly.com/uploads/1/3/5/3/135399424/830994.pdf
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5fe98c597c932.pdf
    • https://nefosedinipal.weebly.com/uploads/1/3/4/6/134698739/88d6d3a8c.pdf
    • https://xuwudivalef.weebly.com/uploads/1/3/4/8/134889087/xuretixa.pdf
    • https://cdn.sqhk.co/gubogezemazo/ieLiglV/rajobilavuwadaweregenonaz.pdf
    • https://static.s123-cdn-static.com/uploads/4406454/normal_5ff1c19b295b3.pdf
    • https://karimimeri.weebly.com/uploads/1/3/1/1/131164281/dirap_wavisaluseveniz.pdf
    • https://kopukomizu.weebly.com/uploads/1/3/4/4/134432002/kinut-wezamomof-jarul.pdf
    • https://cdn.sqhk.co/podoxato/AgiJshi/7th_continent_classic_edition_uk.pdf
    • https://cdn.sqhk.co/borefigux/jifgdib/robotics_engineer_salary_texas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_bf8df0a9bd4d4093ad6e579754452e33.pdf?index=true
    • http://givorajosi.rf.gd/kifofolezazovaferosomu.pdf
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_c4c2ab15fba64b1a8b447ec7068efa88.pdf?index=true
    • http://vokesakogo.onlinewebshop.net/signos_y_sintomas_de_anemia_en_nios.pdf
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_68344dfe2aaa4cf1b1a0f99890090e35.pdf?index=true
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_5ca5caaef576449e9c7682c3a3469f7c.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_off0000fb91.bin
765036922b5240765781ed92830550ad2d0dd2a33bdbb50210e82358740cc70a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 5436 bytes
font_01_sfnt_off00010e13.bin
d85bffd6e58cf1b30104a2ab2ce16e0372cbf0dd28143206064fd655fcbd1ed2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 11244 bytes

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