Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bd6b1dfa120064…

MALICIOUS

PDF

84.9 KB Created: 2021-03-08 23:20:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 091e315f29fa4696152f0883799694dc SHA-1: d95fe391f0dc8b642d0a30ccf4ee616b4ee498c8 SHA-256: 21bd6b1dfa120064bdb6782557247575e60eda0730e8263f8fe934f9c11183e4
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-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://gimoguvi.ru/strik?utm_term=how+to+draw+a+realistic+dragon+for+beginners PDF link annotation
    • https://sivesasa.weebly.com/uploads/1/3/4/6/134669324/bolujopogitozavub.pdfIn PDF document text
    • https://zazukesoj.weebly.com/uploads/1/3/4/3/134317965/2816157.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/ibUuhaK/charli_d_amelio_wallpaper_outfits_jeans.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/jhieOFZ/blood_test_arena_sheffield.pdfIn PDF document text
    • https://cdn.sqhk.co/libarazituw/5ihidwG/target_near_me_now.pdfIn PDF document text
    • https://direnebem.weebly.com/uploads/1/3/4/6/134641367/bepixaj.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/7244956.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/1id2icQ/minecraft_2020_mob_vote_time.pdfIn PDF document text
    • https://metekubop.weebly.com/uploads/1/3/1/4/131438843/wubonerotavuran_digamusiruwo_varobigaxe_xukidarob.pdfIn PDF document text
    • https://cdn.sqhk.co/sinewuvemomi/5wTudkS/rorulemanexixo.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/hshcTjj/rob_van_gameren_f1.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuzofi/dighj2d/pencil_sculpture_art.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_ff791ea862054495ae17246127aa2c66.pdf?index=trueIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_c17a0ff4b72c4b48af57a37c276a4837.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eee3f5e-c66f-465b-ab22-6657266ac9bd/is_evening_primrose_oil_suitable_for_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1328034-95d2-4991-a473-dbdca30c1d39/73568282590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb95afb-c425-4b5b-83ea-aad03fe106e0/ps_vita_slim_charger_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e62240-c2a7-467e-bd5c-0726b69b5c79/keurig_elite_owners_manual.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_ec8c9f72546f45fbbd20371ef2ba7fc7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 5172 bytes
SHA-256: ccb054e4aef85adb55692cc39f7754b4f77814dfbd3e866156a03b939eff54e8
font_01_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 11212 bytes
SHA-256: 12515623e1bd5259f3106369295fa7a90a83ea85adb8e9e7a03e090b4ad4e5e6
font_02_sfnt_off00013808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13808 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361