Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ed00df8129cee7…

MALICIOUS

PDF

89.0 KB Created: 2021-02-15 18:18:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e88253244d6c9994df41ac99370810 SHA-1: 223ecd9c172b9006d041a1c11d4a96bc02b58cc4 SHA-256: d8ed00df8129cee7a1a08022e25859466cfadf83f7d81bd811f4517820a1fa7d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to improve search engine rankings. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URLs suggest the document is used to redirect users to potentially malicious sites, likely for credential harvesting or further malware delivery.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=lucy+jamaica+kincaid+pdf+download
    • https://cdn-cms.f-static.net/uploads/4418590/normal_602a414144a29.pdf
    • https://cdn-cms.f-static.net/uploads/4486765/normal_60192e489aa9f.pdf
    • https://static.s123-cdn-static.com/uploads/4455890/normal_5fd03332264ad.pdf
    • https://cdn.sqhk.co/sifalavuxozo/gjNjhii/6354828813.pdf
    • https://xusofudubivo.weebly.com/uploads/1/3/0/7/130775679/bilogovodogi.pdf
    • https://cdn.sqhk.co/mifigatira/gdD2Ygh/historia_battles_crusades.pdf
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/rafizasibovu.pdf
    • https://fefujosiniw.weebly.com/uploads/1/3/4/8/134862858/wimerodabamafaxojeva.pdf
    • https://cdn.sqhk.co/nitunoda/Mkhhcem/ruberutup.pdf
    • https://cdn.sqhk.co/nadipozow/pPhcY3j/yeast_infection_in_bloodstream.pdf
    • https://cdn.sqhk.co/leredupodeka/fjugfhh/duxibu.pdf
    • https://cdn.sqhk.co/mopomotop/Tgdghic/forklift_truck_daily_inspection_checklist_uk.pdf
    • https://static.s123-cdn-static.com/uploads/4530171/normal_5ff7cd467a8ca.pdf
    • https://cdn.sqhk.co/rijunawep/HgfjbDz/mirror_sculpture_garden_minneapolis.pdf
    • https://static.s123-cdn-static.com/uploads/4408479/normal_5ffb5a58f103f.pdf
    • https://cdn-cms.f-static.net/uploads/4451039/normal_5fd3552a9867f.pdf
    • https://derigibi.weebly.com/uploads/1/3/4/4/134447264/9801858.pdf
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/pezukujeson.pdf
    • https://cdn-cms.f-static.net/uploads/4379370/normal_60176617be595.pdf
    • https://cdn.sqhk.co/jedetanepiz/jeUN5ji/paye_payment_online.pdf
    • https://cdn.sqhk.co/sejejajoxej/jhgFjiA/21364547749.pdf
    • https://cdn-cms.f-static.net/uploads/4404503/normal_6024277ccab73.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00012106.bin
b8682bbb11b31d171d27f2b1ea8ad857dd4ba5f0e09c1b66e50ee2538d27c4e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12106 5300 bytes
font_01_sfnt_off0001332e.bin
dbb6428af3f0c32b649cbdc685010f252573e200e2b49bf864f459ee8c6188ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1332E 10348 bytes

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