Malicious PDF — malware analysis report

Static analysis result for SHA-256 b035b11d52b3fa43…

MALICIOUS

PDF

76.3 KB Created: 2021-02-25 15:13:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 81cd1af6fe9094f05d5c254a4bd91a8f SHA-1: b939b42e37a5194417cfaf7ce005da9370a453c7 SHA-256: b035b11d52b3fa435a88eb6c2439ed763798bd30f489518fc278a6d2a2b1de7d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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://druttle.ru/wix?keyword=mario+brothers+game+unblocked PDF link annotation
    • http://grenkasalo4.xyz/26178198578lg1t0.pdfIn PDF document text
    • https://cdn.sqhk.co/rexukewanej/jwcFkou/teddi_mellencamp_wiki_net_worth.pdfIn PDF document text
    • http://nosinoski.shop/77402126806ka3u5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393759/normal_600936d05e4b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_6035979d6f664.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/cCnhgK7/background_images_hd_4k_free_download.pdfIn PDF document text
    • http://siruxovilojo.iblogger.org/7704865755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421944/normal_5fda23f092104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_6023bb27237c5.pdfIn PDF document text
    • http://ital-tess.space/monthly_bill_organizer_excel_templatemgxk3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nugafafekovad.epizy.com/spotify_online_not_working_android.pdfIn PDF document text
    • http://tubujaj.epizy.com/80617366620.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/femiwapebugafonofujek.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/vowez.pdfIn PDF document text
    • http://bidasumibave.epizy.com/rinisugisetemaxobarivu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 5444 bytes
SHA-256: af5835630837f3be14b59cd6806ab4e6f737562c4ff4a41bd5aefccd3f4f6957
font_01_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 10428 bytes
SHA-256: 09f7099867ed715905998fcf45dde94de79e047eaecae15dc2c7cc339aa72350
font_02_sfnt_off00011609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11609 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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