Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdbb9ca59ee50a3…

MALICIOUS

PDF

81.3 KB Created: 2021-03-22 13:31:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b4b083f83e3a7dad358ea8cc6f12c316 SHA-1: 9487a323e66b198ecb28e21a494c6b390da43696 SHA-256: fbdbb9ca59ee50a3785d1d861e2b8016b87f0f0e710465e6a916af4a3f72149a
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 0.9994

Heuristics 6

  • 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 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://dafemum.ru/wix?keyword=sherita+dixon-cole+37+from+grapevine PDF link annotation
    • http://lunesygets.xyz/kivotidojopod7ravi.pdfIn PDF document text
    • http://molufipet.sportsontheweb.net/brown_bear_brown_bear_what_do_you_see_activities.pdfIn PDF document text
    • http://originalhallyu.com/pilixopebenavafzgy7.pdfIn PDF document text
    • http://tronreserve.online/5052737407972jd6.pdfIn PDF document text
    • http://keep-travel.com/74790342076rs5n6.pdfIn PDF document text
    • http://ital-girl.space/lcp_2_partse4z6e.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/ab96baa5-afb3-4f0a-9b8b-6a3652779512/80936343565.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_a1c1180938b646d682a9f71c85f68be9.pdf?index=trueIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_5226d9a9d08740de89d2db1e1fc425b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee89d8ef-959b-45c6-9f0c-12c2cac3ced7/blackstar_id_core_10.pdfIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_400b51d7261b4086b32949b77fe989a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82906ee-0bdc-435e-9ea2-57efc261ca12/95448149727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc34ce6a-3e48-41e5-b18a-381d1c1bbbed/bepiwosexudozame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d803bec2-3f0c-47dc-9434-cf9ed11f5519/rajulabiduwolonuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e67088-eadf-49f1-988b-b41afcac5dd2/monster_girl_doctor_episode_12_sub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2c1196-c218-459f-9f6a-f56be478095f/shimano_ultegra_di2_rear_derailleur_short_cage.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_c16442af1d124f3c8709ad6f4859b6c3.pdf?index=trueIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_f81bbe3e998a445d9d40fd65b2eb27b3.pdf?index=trueIn PDF document text
    • http://tediguku.atwebpages.com/oxford_word_skills.pdfIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_8ac6f88e2af24a1f98baa59ebf273496.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25023364-2cc7-4ce8-b040-141102d9945f/les_mis_movie_soundtrack_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eca6acb-9aca-4d0b-9c57-c43aebc9ed27/accuair_elevel_parts.pdfIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_ccf2dbe7214347e7af7932932d8e1203.pdf?index=trueIn 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_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 5896 bytes
SHA-256: 53052df76eb8f4b510093c38ce928d692b71d9922cbde218a5ae5382f12e13a4
font_01_sfnt_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 10976 bytes
SHA-256: 9b2ca45a0aa936b06c2bc638a0df0f7911021ea52beaf2934e5eda1b9e4eb727