Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbe4eb56bad1fca…

MALICIOUS

PDF

79.7 KB Created: 2021-02-23 12:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2910f4058d18c4359d1223d4fcb2ddf3 SHA-1: 97d8c4eb478f158530013f7c1576f6adefc1faa5 SHA-256: 4cbe4eb56bad1fca953a7b420f29c3beebbc35c6557946c397014c25f759ede8
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The presence of external URI links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=silicon+controlled+switch+adalah PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446286/normal_5fe6f38c7b89a.pdfIn PDF document text
    • http://qwonder.space/24215137516yjl50.pdfIn PDF document text
    • http://hhizmet.com/fishing_life_vest_near_me0dnyh.pdfIn PDF document text
    • https://cdn.sqhk.co/koxuzofu/gjghDgh/22858917584.pdfIn PDF document text
    • http://phillipen.online/wisapntzpp.pdfIn PDF document text
    • http://palitra-cveta.ru/7174953330p7o0f.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/hBnCjaJ/photo_collage_app_free.pdfIn PDF document text
    • http://businessoutsourcing.org/invitation_letter_template_for_workshophb6yc.pdfIn PDF document text
    • http://bigops.fun/what_are_the_qualitative_and_quantitative_data_collection_methods367dy.pdfIn PDF document text
    • http://itravelgr.com/jofevekutiaw7.pdfIn PDF document text
    • http://miiliioner.xyz/vewesizawibuwilolamubame0lr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_601cabd704020.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/djjKhhH/2377348008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369909/normal_5fe2ca29b7c44.pdfIn PDF document text
    • https://cdn.sqhk.co/nigudovowa/4jhjVif/pound_cake_recipe_extra_moist.pdfIn PDF document text
    • https://cdn.sqhk.co/bozogekeji/r1iczJY/rules_of_survival_apk_data_2020.pdfIn PDF document text
    • http://titoto.xyz/coleman_powermate_5000_maxa_er_plus_wont_startxr08w.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 5224 bytes
SHA-256: ed2b03009d70de92507fa8b4abd351a8e32831d9959942e9bd0f58e5ad76de53
font_01_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 10732 bytes
SHA-256: eea46ffbd74db646c2ab7eb7186f65534d2d6c209fd66223d0c2946d1e81fc68
font_02_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 16372 bytes
SHA-256: bc9d133518941f041cda1c8718e2472003d4da34dbfa742e3922751444972331

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