Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a565d8d38bcd49…

MALICIOUS

PDF

77.1 KB Created: 2021-03-27 20:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 253aa36bb22dfd86d0547ee3c7c76891 SHA-1: 78882ccb95bb11644ea24af7095e81af3ce3533b SHA-256: d6a565d8d38bcd49e51e6bb34cde4480cd357d655321b049cfd404252a1981e3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of link farms often involves redirecting users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=telugu+breakup+audio+songs PDF link annotation
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/rerebifun_rolezudiw.pdfIn PDF document text
    • https://kotevopokevunab.weebly.com/uploads/1/3/4/5/134590751/b5e27e8e28.pdfIn PDF document text
    • https://vapotilixivurok.weebly.com/uploads/1/3/0/8/130814345/8384964.pdfIn PDF document text
    • https://cdn.sqhk.co/zerumowo/hgNsDha/vixalureremuloj.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/qCFbfIF/free_funeral_program_brochure_psd_template.pdfIn PDF document text
    • https://cdn.sqhk.co/lixozimiz/J3gihge/rupuronekosiw.pdfIn PDF document text
    • https://noxolawozin.weebly.com/uploads/1/3/1/4/131452883/xapad.pdfIn PDF document text
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/fba496563fa6d6.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/jFvojjL/stickman_warriors_apk_dragon_ball.pdfIn PDF document text
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/weloxos.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/314c2a02-d3f7-49b1-a703-4984deaca047/huskee_173cc_lawn_mower_carburetor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1096694e-05f8-433a-a0f7-4f39d3c0e302/velozawavob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff29311-4779-4464-bc7a-20887759abe1/what_is_the_deep_meaning_of_the_poem_fire_and_ice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da26ebca-d1b8-4e46-a7e0-e087f450b1ad/baby_goats_for_sale_cadillac_mi.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/97660535040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97453116-7f65-4e7a-9272-04890f97be5b/49877583007.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/zonajavuralixona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519ca93c-980a-42a6-8fd9-caafbb5dbfc0/sex_and_the_city_2_movie_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/bearings_types_and_their_application.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_off0000e5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 5280 bytes
SHA-256: 4ae425982354dcbd7ac24f8c45a365502ed3271391dec8ea237ca4ac6c5142a6
font_01_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 1792 bytes
SHA-256: a2b551832c776e43e00b8e615a36ab5726813e37b79acb53ac974bec532c497e
font_02_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 10972 bytes
SHA-256: 4863509f610a8cb174f93fd45e161c9e5b33bdd4412ace91856d67a8e5e31271