Malicious PDF — malware analysis report

Static analysis result for SHA-256 561e9093020b6146…

MALICIOUS

PDF

74.5 KB Created: 2021-03-21 10:36:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 20b4cb2f9bbff954d88862f056fdb7db SHA-1: 5345408dd33c81466c4413c27b5bce900bce7101 SHA-256: 561e9093020b6146f5cca0e611e25f35f66575517c53930196ef1a70f181e21f
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 0.9996

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://mezovuduw.ru/123?utm_term=opposite+form+of+arrogant PDF link annotation
    • https://cdn.sqhk.co/sarowojep/dihiegd/pocket_world_3d_assembly_models_unique_puzzle.pdfIn PDF document text
    • https://riwaxetonebena.weebly.com/uploads/1/3/4/3/134363930/ziwujapeseti_kavafodejad.pdfIn PDF document text
    • https://cdn.sqhk.co/vefasebo/qihXujj/bride_and_groom_perfect_wedding_games.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazekerubu/ge2FUje/33482050600.pdfIn PDF document text
    • https://cdn.sqhk.co/finelega/iilifGr/lavefowixegul.pdfIn PDF document text
    • http://tugidunamoz.22web.org/pediatric_conjunctivitis_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/gcPhgjg/fashion_story_halloween_goal.pdfIn PDF document text
    • https://tujeliwavujojow.weebly.com/uploads/1/3/5/3/135304707/b416a.pdfIn PDF document text
    • https://worojuwoxalo.weebly.com/uploads/1/3/0/8/130814432/3216726.pdfIn PDF document text
    • https://cdn.sqhk.co/xaveredero/3hioNhb/lobbying_meaning_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/bazurara/jrhdzkN/82799292345.pdfIn PDF document text
    • https://redojakora.weebly.com/uploads/1/3/2/6/132682723/a8461f2dfa1.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/hanncge/how_to_make_a_knife_sharpener.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/ijKhavL/vipafomivafotigezonixu.pdfIn PDF document text
    • https://jubiwaxu.weebly.com/uploads/1/3/4/6/134645567/05103cab4f9.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/jfrKEii/76930971328.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/update_android_huawei_p20.pdfIn PDF document text
    • http://janalusexisowa.epizy.com/landlord_lease_template_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/secure_connection_error_return_code_23.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/tenancy_reference_letter_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/josuvibez.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/75332807619.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_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 5216 bytes
SHA-256: ed2e277c5f4728f5a8d57aa956a2dbdfb1ef9e814ad2c688da4d2644705d70a2
font_01_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 11672 bytes
SHA-256: 2ee6a8c8bd2fb7f5515e3763cd986f4d458cc9e3d592f2f56c627d0e2033ad76