Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfe3d520221bad1…

MALICIOUS

PDF

77.2 KB Created: 2021-03-27 22:25:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d3df60e6425aabdca2580d3ed2fd3e04 SHA-1: 2e41d6b9a312553c15da47ec64b268cdb408700d SHA-256: 4cfe3d520221bad1985d4d31201ed7f5e7c8a8480220ba47a6d4aaf248f1722f
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 0.9956

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://soxebez.ru/123?utm_term=auto+repair+authorization+form+template PDF link annotation
    • https://cdn.sqhk.co/sotisibu/Pfjgieg/menuk.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/ijMUhhj/rewelezipukolugemisaw.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/Uhdhbyj/pixel_gun_shooter.pdfIn PDF document text
    • http://verifybadgesbusiness.com/which_streaming_service_pays_artists_the_most_20195msk4.pdfIn PDF document text
    • https://cdn.sqhk.co/rizavoxaje/Ohigdje/vazanediposomulafomefoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/kagalitisup/ihNcugf/3_yellow_classic_cheats.pdfIn PDF document text
    • http://wdd13.ru/xezujude65o.pdfIn PDF document text
    • http://xitnet.fun/advanced_spanish_grammar_a_self-teaching_guide_by_marcial_pradoxv8ws.pdfIn PDF document text
    • http://twitter-center.com/6745691399p30y2.pdfIn PDF document text
    • http://kushtanash.ru/91482390968dvom1.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxezitowefi/jeicVxF/port_lympne_zoo_stay.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/de472808-052e-4d3a-b552-46c260e3afa7/super_mario_sunshine_nintendo_switch_controls.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/tamilrockers_2019_tamil_dubbed_movies_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/lolabefoligeza.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/tri_hexaflexagon_template.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_cb96937e9a52472686f89587e6ca8dbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lewuli/cursive_writing_worksheets_alphabet.pdfIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_ab0f52652a1d4c7bad78da8295f9c7d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30611232-1507-47e5-b6b3-292039ccf607/garmin_nuvi_2797lmt_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a65b7cc-bc97-4a1d-9e24-8d430c9ec2e2/nancy_drew_clue_book_dra_level.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb21be7e-2f69-4b80-905c-8f5b04520ecf/basic_korean_language_words.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_1ae17a28bc4348e0a052baf0408540b0.pdf?index=trueIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_3360e98513074c1bb1ab7cc6768524b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e7b2824-edea-4619-819a-27c32e7b03eb/mr_coffee_coffee_maker_reviews.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_089164644eaf4af7a335cbba51a3b047.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/what_are_low_carb_bagels.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_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 5004 bytes
SHA-256: 95e8537103dd801dad41cac7989d693dee997a6868c4617f4d1c0ca88cbd5ffd
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 10680 bytes
SHA-256: fd009d22c7e19bde03a0f77c1a6d81d787673b7d3ec26583e1a2ea52f1d15847