Malicious PDF — malware analysis report

Static analysis result for SHA-256 336cf71b1722e9af…

MALICIOUS

PDF

73.3 KB Created: 2021-02-01 04:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6d35c81fb4d5e64e3f82fa2c3442dcff SHA-1: e2f31187f4a14d700e0f8fff645870bcf48f5e9b SHA-256: 336cf71b1722e9af910284509879153f1bb6ee21023f9c245aecf1437f6e7c3e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 threat. It contains numerous external URIs, including one pointing to 'crophysi.ru', disguised as song lyrics to lure users. The document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect users to malicious websites for further exploitation.

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://crophysi.ru/123?utm_term=dance+dance+dance+justin+timberlake+lyrics PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475866/normal_5ff16e52371b1.pdfIn PDF document text
    • http://devgm.design/twilight_free_online_movie_no_downloadj2a1e.pdfIn PDF document text
    • http://kind-insta.site/2._1._4_super_cleanup_karel_answercyxjp.pdfIn PDF document text
    • http://weinmvc.net/942719277970c2vr.pdfIn PDF document text
    • http://helpcenter.business/booyah_baits_xcs_squarebillo82xk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425501/normal_5ffccc2a8b079.pdfIn PDF document text
    • http://bujinolemisizam.iblogger.org/plant_vs_animal_cell_quiz.pdfIn PDF document text
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/sunexedarapusab_vorupov_vubes_tefozogunaf.pdfIn PDF document text
    • http://libralab.digital/celo_willie_colon_acordes809gv.pdfIn PDF document text
    • http://znakomstva18x.site/607085696172elf9.pdfIn PDF document text
    • http://reduslimitalia-official.website/53057009226qk5vn.pdfIn PDF document text
    • http://domensita.fun/wogakelexejojuba45ds4.pdfIn PDF document text
    • http://smcjd.com/jizaberarojojakanemexawioi775.pdfIn PDF document text
    • https://kokujilu.weebly.com/uploads/1/3/1/4/131453241/d09073aeda8b4e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_5fd9bc352564e.pdfIn PDF document text
    • http://bit7.top/science_and_development_of_muscle_hypertrophy_downloadi6nuy.pdfIn PDF document text
    • http://groshyk.site/hacker_techniques_tools_and_incidentl85q5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 5464 bytes
SHA-256: ec07f76652f8878c3355bc6e3a6812538a135e07416779836660d0133e204b4b
font_01_sfnt_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 10832 bytes
SHA-256: 3436faa47822e4b6442a71d2cfe0c22bdd28d8f00ff975dabcc7488b29c7ded6

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