Malicious PDF — malware analysis report

Static analysis result for SHA-256 2305adccf1ffe97f…

MALICIOUS

PDF

77.2 KB Created: 2021-02-28 01:38:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4ec559722a729306c6823c05bab68993 SHA-1: 56b6157dd551db4c724613576885572709fa4b83 SHA-256: 2305adccf1ffe97f0a32398c6c14c68c35ad8e15c32ffbe9d27acef120531827
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with the primary one being `https://seumenha.ru/wix?keyword=animal+organ+systems+cloze+answers`, suggesting a lure to a malicious website. The document body, though heavily obfuscated, contains references to 'animal organ systems cloze answers' and 'wkhtmltopdf', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=animal+organ+systems+cloze+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484821/normal_6016435a8e3ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410414/normal_5fde654882e8f.pdfIn PDF document text
    • http://greenbike.shop/585429667724g16g.pdfIn PDF document text
    • http://azorocheat5.xyz/xesopoxarukafoprw14d.pdfIn PDF document text
    • http://tersq.fun/kakomegopumedilj3gvh.pdfIn PDF document text
    • http://pidawudimo.scienceontheweb.net/zemutuziramuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387573/normal_600afec02a256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_601581fc1822e.pdfIn PDF document text
    • http://shoop-fo.ru/amped_wireless_setup_guide_sr10000x8ezr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuxikujare.epizy.com/stephen_king_books_in_order_of_publish_date.pdfIn PDF document text
    • http://dipulitexaxuz.epizy.com/gukifiwatazu.pdfIn PDF document text
    • http://dixasimoxipux.rf.gd/android_app_screenshot_size.pdfIn PDF document text
    • http://najorenowodume.epizy.com/nukezagegewosabaduwo.pdfIn PDF document text
    • http://gapisamiwabu.epizy.com/mezogenitazexemusesomixo.pdfIn PDF document text
    • http://jukerozugixejad.rf.gd/54361751398.pdfIn PDF document text
    • http://puwepubofixa.epizy.com/cica_care_silicone_gel_sheet_instructions.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_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 5352 bytes
SHA-256: 676de6539f22e3d49dab5e1c5998577ec7a235305d04eea12b5528660461657b
font_01_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 10580 bytes
SHA-256: 65f9a577a886ff3b6be402685dcfedf81381d6a8852aaf69f8e4911bc753ad7a

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