Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edcc3840b5969ad…

MALICIOUS

PDF

87.6 KB Created: 2021-03-07 15:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45a38fd5d942d6cdae67d45fb0ec25bb SHA-1: 9002f58047236626dbf9540d7ea0a6ccd4b9e219 SHA-256: 3edcc3840b5969ad1d21c1cac595c4380caf8bf5ae38410e777239116657cc8e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of external links, indicating a potential link farm or phishing attempt. The primary URL, https://jumiwimov.ru/strik, suggests a lure related to a product manual, which is a common tactic for phishing. No scripts were extracted, but the presence of numerous external links points towards an attempt to redirect the user to malicious websites.

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://jumiwimov.ru/strik?utm_term=shark+pro+steam+pocket+mop+user+guide
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/9042228.pdf
    • https://cdn-cms.f-static.net/uploads/4409393/normal_603cb7bc9348a.pdf
    • https://suguturame.weebly.com/uploads/1/3/1/4/131438741/4d8e7b2.pdf
    • http://mozodulo.iblogger.org/nintendo_wii_console_for_sale_east_london.pdf
    • https://cdn-cms.f-static.net/uploads/4379837/normal_601e03e630634.pdf
    • https://gisipunav.weebly.com/uploads/1/3/1/6/131636927/9c260.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nunelaxe.epizy.com/52890174288.pdf
    • https://s3.amazonaws.com/sirilagewuga/79782741006.pdf
    • https://s3.amazonaws.com/wiwamoxamo/kgf_background_music_naa_songs_free.pdf
    • https://s3.amazonaws.com/kujapomib/good_food_guide_christmas_recipes.pdf
    • https://uploads.strikinglycdn.com/files/1437ac60-b84d-4015-8473-73f39172cb74/is_heat_surge_still_in_business.pdf
    • https://uploads.strikinglycdn.com/files/2c6e75ef-fd7d-4dfb-9792-3a5d4cc16a06/big_java_late_objects_2nd_edition_github.pdf
    • https://uploads.strikinglycdn.com/files/b0be78f9-a28a-44ec-84cf-6c8871d45575/8538150641.pdf
    • https://s3.amazonaws.com/xufaxoferugod/xenopulojenelexinotomi.pdf
    • https://uploads.strikinglycdn.com/files/02956043-6a48-4c45-8cd5-3742acbac61f/why_writing_research_papers_is_important.pdf
    • https://uploads.strikinglycdn.com/files/d10fc586-d468-4255-9a39-007addbe08cf/xafofagubomawagoletumol.pdf
    • https://uploads.strikinglycdn.com/files/8e52e35d-25ac-42fa-8141-af935efbbe39/what_happened_right_after_the_brown_v._board_of_education_decision.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109b8.bin
5ca269d388cc914a141478a4d2da639cf289875090c92d36a1c9aa2493fa607c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 5400 bytes
font_01_sfnt_off00011c0d.bin
68650e66121154e10e482494d1f205df90b652ea290a14f7bdc4ab9266c2ab30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0D 11176 bytes
font_02_sfnt_off00014193.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14193 4324 bytes

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