Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b621239d4ef6d76…

MALICIOUS

PDF

96.7 KB Created: 2021-03-14 21:01:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05c7e51adb5f596e3993105ea9e35a44 SHA-1: eec2d4e7cde60d04f2f7594b2abc2c0fb44071c5 SHA-256: 4b621239d4ef6d760969e0dd104e3fb1bb5a1126ec082210844c12c1a275fe32
126 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing site. The PDF also exhibits characteristics of a link farm, further supporting its malicious intent.

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://fokemale.ru/123?utm_term=barbarians+of+lemuria+pdf+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480173/normal_5ff9c87a10cd9.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/Hgggrje/stickers_for_water_bottles_and_laptops.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462727/normal_602663ab9ecae.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/73fm4hh/33387574086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_601519b17832e.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/WtIgdji/35681633768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499319/normal_600fc7eaeadef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a510e22-e134-4c25-aaa8-599615a8022c/yamaha_rx-a820_bluetooth.pdfIn PDF document text
    • http://puzexexaniledow.epizy.com/puwureserixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f3d487-d170-4795-a859-7946b65bf46d/26028568004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e7e830-8a1a-41b5-a781-8649d4f3681d/15827140746.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/resurikutokizabijexivutum.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/ambari_movie_all_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a2ce30-e5d7-4d73-8985-beb4dacaa3b7/xosagogipadavozurefaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f46319-c6a0-48a3-a5d2-df7940f673fc/howard_leight_impact_sport_electronic_earmuffs_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9851e2f4-b711-44b7-b9a3-c9470ab4e96f/rabom.pdfIn PDF document text
    • http://lotirejotan.rf.gd/gumoxaxek.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/valentina_studio_free.pdfIn PDF document text
    • http://boxatofidomi.rf.gd/how_to_change_hp_deskjet_ink.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_off00013b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4C 5376 bytes
SHA-256: 3da30e502dcf33077d1ae9beed709aba18dd3869af2b73c1e84d0c404a713394
font_01_sfnt_off00014d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D77 12120 bytes
SHA-256: 08fb1fb9f0ab6c58da4684d6098c8a08cef50debb15ebbbc255cbfcf9b369b2d

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