Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f9b9a92175cadc…

MALICIOUS

PDF

108.3 KB Created: 2021-05-28 08:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 435ed7ec10758b90547c434ae8d4fde9 SHA-1: ee36fe9dd60fa39fc57bf6a2130ca05742f236dc SHA-256: 79f9b9a92175cadc1853db8786318a416b2d862f6ab5d2dd41388dfe981bd478
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malicious content delivery attempt. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=agnes+heller+libros+pdf PDF link annotation
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/fozujobuluni.pdfIn PDF document text
    • https://pelirexasi.weebly.com/uploads/1/3/4/3/134352860/memozor-vegukufa-diladomokipeju.pdfIn PDF document text
    • https://pakowojazawari.weebly.com/uploads/1/3/0/7/130775116/7719599.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/vegew_mojakuzizi_tarudamupa.pdfIn PDF document text
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/werukuroridiri_vipasojupokom.pdfIn PDF document text
    • https://miragitoketulo.weebly.com/uploads/1/3/3/9/133997248/3545321.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/5954262.pdfIn PDF document text
    • https://fazodokivev.weebly.com/uploads/1/3/4/0/134018208/6435801.pdfIn PDF document text
    • https://wevapagavum.weebly.com/uploads/1/3/4/3/134306171/5939952.pdfIn PDF document text
    • https://jakugogafezokev.weebly.com/uploads/1/3/1/4/131437362/9912435.pdfIn PDF document text
    • https://wegejazibeb.weebly.com/uploads/1/3/5/3/135305894/e431e7f028.pdfIn PDF document text
    • https://jikigalogadod.weebly.com/uploads/1/3/4/6/134647375/d9e56ddd4b6755.pdfIn PDF document text
    • https://tuwazumabokanif.weebly.com/uploads/1/3/4/6/134611666/00303e8eaba.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/3677a078-4300-44ef-98d8-738c881115d2/new_wimpy_kid_movie_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7deaf6-6584-4148-b4a3-35ba5a768024/how_to_reset_tws_earbuds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/276b255c-d37b-45d2-8396-14d266750511/nexowodison.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946177a5-6277-48ef-bcfc-d80c19a9fc28/78704766350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf7f6c8-1bbb-4e24-842f-505dd103dc7d/human_physiology_class_11_notes_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86da4a40-c26e-4458-8d99-c6cc94602b16/how_do_you_type_greek_letters_in_word_on_a_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40118ae5-8202-4be1-8e8d-16b4393f11b7/78051774116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d9113b-8bf9-433f-9782-367931fd71b9/parkour_games_for_pc_under_500mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ee60a8f-659b-4bdd-854e-d60da16e99ae/ethical_hacking_course_syllabus.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_off000167fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167FE 5220 bytes
SHA-256: 298bbd9ceeeab555149ee16141bd5ca08d2375ee5eb78d36eaf0cf98bd501abb
font_01_sfnt_off000179bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179BD 13392 bytes
SHA-256: 6990b699823706dd06a03bfb7e4ce2ecc598e6fd39e780835796fab407c48779