Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd84476b13979731…

MALICIOUS

PDF

81.6 KB Created: 2021-03-08 22:50:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6de950317711afbe1ceac0b43bf5ab58 SHA-1: 11649da4739e39011cd394e094ba5b775e7cd96f SHA-256: dd84476b13979731924d4c809559efecf6fcd4ea77792c3a83709c071efb2038
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 0.9954

Heuristics 6

  • 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 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://botokaw.ru/strik?utm_term=michael+pollan+eat+food+quote PDF link annotation
    • https://cdn.sqhk.co/peluxisomex/ifTgehv/athletic_apparel_companies_market_share.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/dfhjjgI/jolikamik.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/heXthit/nova_launcher_app_drawer_icon_missing.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/L2Kjbjc/11283954953.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwavewo/Wjicibx/advanced_english_test_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/dXhedhb/fishing_break_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/hGhehdZ/toy_cars_for_toddlers_to_ride.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoziku/wAibwob/skate_art_3d_game.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/jcrgcji/90079587974.pdfIn PDF document text
    • https://cdn.sqhk.co/wazotifuk/jijBhfR/sutawajuzigimesedoroko.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/bhdYACZ/fall_guys_game_season_2.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/ieEhjhd/best_video_player_for_macos_high_sierra.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/jbmhjV5/noticias_alfa_romeo_f1.pdfIn PDF document text
    • https://cdn.sqhk.co/pitadewedobu/jiaihge/besikesadasinavanul.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://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_b1137e12055c463682d8121f8f1543e2.pdf?index=trueIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_ce81686b2b7f4f47a9aa874a0be347bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b66869f8-4898-4547-bcec-e470de9ec874/fe3_to_fe2_is_oxidation.pdfIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_89ccbc7f8ec049bc909e53b1e29cf953.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/cement_sheet_cladding_profiles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46200722-8791-4984-a24a-f5fd2bab1819/how_to_talk_about_the_structure_of_a_poem.pdfIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_cacc07cbd0e345c28faa085b63762ba9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b567d96f-c478-4b56-bf13-d6673e6c338f/photos_of_ashton_kutcher_and_his_twin_brother.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/leapfrog_leaptop_connect.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef86d8c-8247-48da-8734-31e2299f05ae/what_generation_is_my_kindle_paperwhite_2012.pdfIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_a1a5be99072f45138c8425393c277154.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/deled_2018_marksheet_semester_2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 4980 bytes
SHA-256: f28bb7126af02e015529b4a46e772b5f25ac4315a0c590cc0883e71a8acdfaae
font_01_sfnt_off000104d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D5 11104 bytes
SHA-256: 7f17d573c54cd20284d8af80f75d334fd136c52122c0ea1b2f0a4e0c258e0415
font_02_sfnt_off00012a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3