Malicious PDF — malware analysis report

Static analysis result for SHA-256 afda4368a6f88652…

MALICIOUS

PDF

70.3 KB Created: 2021-04-06 13:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 492b1306ff5b465d8e46a8c7a0279a87 SHA-1: 7218759ce0585f325c1377c76605fbb0111b1bf7 SHA-256: afda4368a6f88652cc80b7a25e7e1810dc53d269e4d39a5b19c7007a51eaa541
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://bologen.ru/strik?utm_term=funny+fake+book+covers+subway PDF link annotation
    • http://zivemigidefis.mypressonline.com/lazazoberolesejezemenami.pdfIn PDF document text
    • http://totalcreditreport.info/358143913171nye5.pdfIn PDF document text
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/mowomiso_winezumip_jizagiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/cgjggu6/big_battle_3d_mod_apk_unlimited_money.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/axial_scx10_ii_honcho_bumper.pdfIn PDF document text
    • https://jowatewiko.weebly.com/uploads/1/3/1/3/131380225/wakepuno-jakidepolofod.pdfIn PDF document text
    • https://lexaxaverewazud.weebly.com/uploads/1/3/1/3/131381910/1875051.pdfIn PDF document text
    • http://twoup-viktoria.online/their_eyes_were_watching_god_chapter_9s6sn8.pdfIn PDF document text
    • http://yourdesk.website/iss_pyaar_ko_kya_naam_doon_online8enkn.pdfIn PDF document text
    • https://fapudajom.weebly.com/uploads/1/3/2/6/132681453/5111836aaa.pdfIn PDF document text
    • http://gapokaro.mywebcommunity.org/bcg_problem_solving_approach.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/u4oMigj/54477515502.pdfIn PDF document text
    • https://lefatelaxebaj.weebly.com/uploads/1/3/5/3/135398996/rejorebumom_wepijaret.pdfIn PDF document text
    • https://xotubowewetiner.weebly.com/uploads/1/3/2/6/132696149/5108946.pdfIn PDF document text
    • http://giftcard-sale.store/58434640965jjk5n.pdfIn PDF document text
    • http://erogan-encolumbia.site/the_danger_of_a_single_story_exam_questionsi48c8.pdfIn PDF document text
    • http://naturebiolog.space/44557991824j5e3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/battlestar_galactica_board_game_rules.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D8 5256 bytes
SHA-256: 78a917c18f852b992800cc997e195dd1672904fc5a06bba741387c4a72a68a6d
font_01_sfnt_off0000e7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 10496 bytes
SHA-256: 41062c4b59638c31fa13a08d250a4fed757ddcbbb403fb0ed0781f63372d45dc

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