Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6fc88fafaa4796…

MALICIOUS

PDF

70.8 KB Created: 2021-03-19 10:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e372f914adcd65daee7391d2af5ce73d SHA-1: 145eb1616d853c2692f65451043335f2cc135726 SHA-256: be6fc88fafaa47961dbce5294cd015d7acd4780f92741ebfa10a5be1a3cc23bb
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. ClamAV detection and ML classification strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users via external links.

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://lozipotod.ru/wix?keyword=cross+section+of+the+earth+to+label+ks2
    • https://cdn-cms.f-static.net/uploads/4414341/normal_6025af2cab132.pdf
    • http://lojapidabud.mypressonline.com/how_do_you_write_an_introduction_for_a_descriptive_essay.pdf
    • https://cdn-cms.f-static.net/uploads/4471082/normal_5fd2d3a09d91a.pdf
    • https://cdn.sqhk.co/xotakuzazuf/9ichhih/8938109207.pdf
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdf
    • https://cdn-cms.f-static.net/uploads/4459921/normal_6037e2808d80e.pdf
    • https://cdn-cms.f-static.net/uploads/4493888/normal_6045e305dcf52.pdf
    • https://cdn-cms.f-static.net/uploads/4372955/normal_603e8eff79d36.pdf
    • https://cdn.sqhk.co/gosukutusu/hjcbjdN/frog_paper_plate_craft_template.pdf
    • http://novubelugalij.medianewsonline.com/adobe_editor_mac_free.pdf
    • http://gukopujix.22web.org/lamokabigodisi.pdf
    • https://cdn-cms.f-static.net/uploads/4501046/normal_5fdac5e6afdd1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kojenixerog.myartsonline.com/jump_rope_songs_lyrics.pdf
    • http://zidaposiwogo.rf.gd/what_does_error_30103_mean_on_netflix.pdf
    • http://wijuweluxevem.rf.gd/32221835291.pdf
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_3d8878517e5a41d485357cba85e844e5.pdf?index=true
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_8b8b0c17dfd040d2a408aeb01392a5d9.pdf?index=true
    • 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_off0000d8dd.bin
bc13b7e76bef3ebc3dd133eccdbe29dd6f03c4405076776ca92bf21df4bb46c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 5208 bytes
font_01_sfnt_off0000ea8c.bin
9e3586986c720e6d1c25fd9e3e2ff367642fce3d210bd6d63f02e055ae216cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 10440 bytes

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