Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d55f6fd830acdf…

MALICIOUS

PDF

71.6 KB Created: 2021-03-28 13:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e3f9ba7d253b3bbdee1c79fe620c32d2 SHA-1: 3013734ac1c2c54d1ab4927128ecb5c93c329a70 SHA-256: 84d55f6fd830acdfd370bd01d083b1310b09931558b99ee9d877a5dd0e7eb2fa
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 high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/123?utm_term=pilates+reformer+exercises PDF link annotation
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/womogiviz.pdfIn PDF document text
    • https://dopovubejaxow.weebly.com/uploads/1/3/4/0/134017692/fasotosagom.pdfIn PDF document text
    • https://wexopusipomela.weebly.com/uploads/1/3/5/3/135313487/kimepafosovojilej.pdfIn PDF document text
    • http://gudelew.mywebcommunity.org/terupulibibaropowi.pdfIn PDF document text
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/7c53d13fae19.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/oQie7ic/65818439786.pdfIn PDF document text
    • https://mosezogojufotu.weebly.com/uploads/1/3/0/8/130813841/ruwig.pdfIn PDF document text
    • https://jasofemelufes.weebly.com/uploads/1/3/0/7/130740231/dajuji.pdfIn PDF document text
    • https://raxagipob.weebly.com/uploads/1/3/4/8/134883443/7a3eca143.pdfIn PDF document text
    • https://cdn.sqhk.co/lekifuwixal/cxhiggX/does_amazon_prime_video_have_local_channels.pdfIn PDF document text
    • https://taxamoxegira.weebly.com/uploads/1/3/4/8/134895948/015cdb740c.pdfIn PDF document text
    • https://lemarowaverixax.weebly.com/uploads/1/3/4/3/134371099/1735326.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/8085686.pdfIn PDF document text
    • https://cdn.sqhk.co/zotiperugi/fVjhqNt/monster_battles_tcg_cheats.pdfIn PDF document text
    • https://rumeravovavupol.weebly.com/uploads/1/3/4/6/134619367/8251083.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/amebiasis_cutanea.pdfIn PDF document text
    • https://kawuzuke.weebly.com/uploads/1/3/1/6/131606938/jidunuvununujawufiw.pdfIn PDF document text
    • https://pagajunudew.weebly.com/uploads/1/3/5/9/135992687/8864356.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/4afb3460-ce51-4be4-9469-0cdd948ca393/gigofelozugex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d852ef28-ba8f-4ed7-8da1-858c29dfada8/insinkerator_66_installation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf204b4e-12c8-4857-88a6-10231a31955b/fedisawuzelu.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/craftsman_professional_aluminum_motorcycle_atv_jack_manual.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_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 5096 bytes
SHA-256: 9d6fb2c92dc4ad2c23e75a2ca2ddd90d6e7103b4da11da25d2a0a54eaf4d31dd
font_01_sfnt_off0000eda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 10320 bytes
SHA-256: 378720f5eef4adaff4368d5644369f7496c90ccd3561b02729d18195bb1aeb22