Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf12311d871894b…

MALICIOUS

PDF

85.6 KB Created: 2021-03-12 09:22:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 883ddcd4cd2e745510168462b458c4b9 SHA-1: b26eedbec11e3cabbf7d530b7433cf6998488ceb SHA-256: 2cf12311d871894bbd6a4fc000376679d03b05e0f8033a2dfda11b00fe9e75d9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/123?utm_term=landscape+design+architecture+pdf PDF link annotation
    • http://xiruzox.mygamesonline.org/mackie_mix8_vs_402vlz4.pdfIn PDF document text
    • http://saniwofixapu.mygamesonline.org/57225670013.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/hoover_floormate_deluxe_hard_floor_cleaner.pdfIn PDF document text
    • http://xemopubuga.iblogger.org/giginogunofiliroduw.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://uploads.strikinglycdn.com/files/f3a67b80-ec96-42b8-bc8b-7a48f39bd1eb/bionaire_tower_heater_fan.pdfIn PDF document text
    • http://xojakawarola.rf.gd/47975699725.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/calculus_equations.pdfIn PDF document text
    • http://xavisijividefo.epizy.com/79484231567.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_33e72ba57a95473f8b9015e058ea95ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xirixepo/luwew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9131d8d1-1f7a-4f42-ba05-85c5407e2dd0/tales_of_dunk_and_egg_show.pdfIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_a6e72a7281624b78af518cd00782df15.pdf?index=trueIn PDF document text
    • http://gesinofafag.epizy.com/wewavukitepevamemufilanav.pdfIn PDF document text
    • http://bodagoge.epizy.com/default_judgement_high_court_template.pdfIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_2363132f844c46f2bbb019d30a52f27b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b19627b-d29a-426e-9fa9-9d22fdf372af/nowidezijiwobamevoratubuz.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/xadufikazudawifenuge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a8e821-e65c-4a12-925f-4602325d80cc/lopi_1750_wood_stove_for_sale.pdfIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_6b8cca018a20459fa1471a515485688a.pdf?index=trueIn PDF document text
    • http://pekafujojef.onlinewebshop.net/what_survival_games_are_on_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef61e809-9c8b-43bb-a99d-11f34a4a3828/68799800052.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/zorogigi.pdfIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_5d3bde7083254d47bed164364fd969d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa79f3f-a273-45aa-b6a3-1e93bc476f81/how_to_write_a_letter_ireland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ebc6b19-da16-4ade-9d8e-17058294bd5b/crossword_puzzles_help.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_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 5096 bytes
SHA-256: bcf12f1bef258bdce757655e4ebd17f7dfc566059bb57c6ae91b5b23ef16471f
font_01_sfnt_off000116b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B4 10628 bytes
SHA-256: 19e2ce12910f993b25dd20513413088a73d65368795bb67707e60e29a4d9c1fc
font_02_sfnt_off00013ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c