Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13f438ea3d5832f…

MALICIOUS

PDF

77.3 KB Created: 2021-06-05 05:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dcd3eb3c7d49893e441bb7f7d54a931 SHA-1: 697d964343350b83b54a6be3b978626fb1718044 SHA-256: d13f438ea3d5832f1230b808dfbf13d25f3eb3b03a1d210e2a0611984ad608af
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://dafemum.ru/123?utm_term=interview+skills+workshop+pdf
    • https://dolopexoje.weebly.com/uploads/1/3/1/8/131872138/5651642.pdf
    • https://dozisinabi.weebly.com/uploads/1/3/4/6/134646642/kilepowilo_gulufalit.pdf
    • https://fomomeku.weebly.com/uploads/1/3/2/7/132712435/ffc7b1de8157cc8.pdf
    • https://static.s123-cdn-static.com/uploads/4367294/normal_5fe23a0f2d233.pdf
    • https://static.s123-cdn-static.com/uploads/4491159/normal_5fe3e43d10921.pdf
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/ebfd15.pdf
    • https://cdn-cms.f-static.net/uploads/4391634/normal_6030402630034.pdf
    • https://guladusive.weebly.com/uploads/1/3/0/9/130969442/mibedinorafavo.pdf
    • https://fowidejufato.weebly.com/uploads/1/3/4/5/134582967/xigowizopitesut_ridojefifagovaw_winez_dofodus.pdf
    • https://midazumetewafaj.weebly.com/uploads/1/3/4/2/134266273/2785409.pdf
    • https://cdn-cms.f-static.net/uploads/4418783/normal_60151e4b1a83d.pdf
    • https://waraxisunagigam.weebly.com/uploads/1/3/4/1/134131416/kiwuvisafuruzotoduku.pdf
    • https://cdn-cms.f-static.net/uploads/4454425/normal_6067db29e1b70.pdf
    • https://xivafotipumi.weebly.com/uploads/1/3/4/3/134322080/jemevaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://daridameku.pbworks.com/f/how_to_use_fusible_pellon.pdf
    • http://zewalar.pbworks.com/w/file/fetch/144472281/how_to_perform_a_dexamethasone_suppression_test.pdf
    • http://dobifapig.pbworks.com/w/file/fetch/144570420/ellipsis_and_substitution_grammar_exercises.pdf
    • http://xalomuzavege.pbworks.com/w/file/fetch/144586572/xoxivomapikap.pdf
    • http://palixazoke.pbworks.com/f/xolosu.pdf
    • http://gibuwodebu.pbworks.com/f/two_examples_of_situational_irony_in_the_crucible_act_3.pdf
    • http://kibumezi.pbworks.com/w/file/fetch/144467217/57978894839.pdf
    • http://mukibilevejo.pbworks.com/f/download_bts_bon_voyage_season_1_behind_cam_sub_indo.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_off0000ee7b.bin
78f34193930a5a6f9aadec9df1127b218343e72c0e2d85b2f318fd1756554df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 5072 bytes
font_01_sfnt_off0000ffcf.bin
87edb090d9d77a96fb50a1bd04ed2045e2af0f6666644dc5dce2d21801691a18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 11740 bytes

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