Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4db121ca8174df3…

MALICIOUS

PDF

80.3 KB Created: 2021-03-19 16:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab98c951cb32d12b6f05e0f671d5f5eb SHA-1: 179ed7980cc61feb3d9f66453534c38a558fa19a SHA-256: a4db121ca8174df3a5f5fd10b30ebe6aedb54aa7d22caf0bff494085c33ad949
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule indicating a large number of external links. The ML classifier and ClamAV also identified it as malicious. The primary URL, https://ponafet.ru/strik?utm_term=sierra+125gr+30-30+load+data, suggests a lure related to ammunition data, likely to trick users into visiting a malicious site. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=sierra+125gr+30-30+load+data
    • https://cdn-cms.f-static.net/uploads/4475217/normal_6046036b8bbfc.pdf
    • https://cdn-cms.f-static.net/uploads/4456728/normal_60403f947e0a1.pdf
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5fd2d8837cb9f.pdf
    • https://cdn.sqhk.co/golemejexeno/0ibjhhe/farm_heroes_saga_levels_with_fireflies.pdf
    • https://cdn.sqhk.co/netimawifes/VNicWcT/csr_racing_2_pc_car_list.pdf
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/sinukudikupipake.pdf
    • https://sixexarujizevav.weebly.com/uploads/1/3/4/5/134584368/1576151.pdf
    • http://makedctl.site/9395360925lophg.pdf
    • https://cdn-cms.f-static.net/uploads/4419847/normal_600f203fa6779.pdf
    • https://cdn.sqhk.co/fudimesa/hhgGlgi/19560749917.pdf
    • http://aazzzry.space/diamond_mobile_legend_free_tips1bumq.pdf
    • http://1xbet-registr.site/what_is_a_democracych84m.pdf
    • http://minuette.me/camp_x_ray_movie_download_300mb8e5bp.pdf
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/jaliwimokuxujivexif.pdf
    • https://cdn.sqhk.co/wejideduv/YhbjjSN/i_love_crosswords_2_level_19.pdf
    • https://cdn.sqhk.co/nobixapo/fd0gdha/baby_shark_costume_diy.pdf
    • https://cdn.sqhk.co/givesaxi/PhgkPgf/fazuve.pdf
    • https://cdn-cms.f-static.net/uploads/4481280/normal_602a8156077f7.pdf
    • https://cdn.sqhk.co/sebutarukaw/jimicgj/figozik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/baxunaf/identifying_figurative_language_worksheet_1_answers.pdf
    • https://s3.amazonaws.com/jivuxo/39728290611.pdf
    • https://s3.amazonaws.com/wakuzidi/fundamentos_del_marketing_digital_google_respuestas.pdf
    • 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_off0000fafe.bin
4566fa22edd863e8eea08882240271586356589a1ef9eb7fa0e6026e3ea5e710		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 5564 bytes
font_01_sfnt_off00010e08.bin
484abc92577a210b9db4ffb563a58a044fcb2e4b3397fa900483c2603beeccec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 11160 bytes

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