Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cac4eb3f1e70581…

MALICIOUS

PDF

77.3 KB Created: 2021-03-24 07:14:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4b146175fe446a653696717aa69d5b74 SHA-1: b0ac166e3ea95469aa04498d70fb8c83da8812b2 SHA-256: 4cac4eb3f1e70581cd0f9bf6ff382834171f96bf0d30e86de43e7e7b5225de1a
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 functions as a link farm, containing numerous external URLs that point to other PDF documents. The primary malicious activity observed is the aggregation and distribution of links, likely to facilitate phishing attacks or distribute further malware. The presence of a `utm_term` parameter in one of the URLs suggests a tracking mechanism, common in phishing campaigns.

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://lozipotod.ru/strik?utm_term=who+makes+vissani+brand PDF link annotation
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • http://sevisotesasare.iblogger.org/idealism_vs_materialism.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/fgedjiJ/contract_killer_2_mod_apk_offline_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/jidBhiu/wiravu.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/gdhciiO/drift_tuner_racing_mod_apk_android_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_e00524dfd65945b7b2e470dec0e1af05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/941c3e47-d2e9-4253-979f-c0395a5ece7c/nonovipupigekonulezuvalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa45e0db-c679-499a-a90c-9ce6b0ec40d9/bumovalenopokev.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/circle_logo_template_illustrator.pdfIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_be3e99c95ea747c0b6d168afce7d25e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9fca210-71a1-471a-883b-ca7a2c494de9/how_a_bill_becomes_a_law_game_board_project.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e1e7eed-09c6-492d-bc31-a0ba6d2b0583/sri_rudram_namakam_chamakam_lyrics_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/596a1cd8-39d0-4011-8746-084eee6fbe7b/harvard_law_clerkship_cover_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/136050c7-7520-4f42-922c-e359d8d2990b/18107637713.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/53288829723.pdfIn PDF document text
    • http://gasadilipebafup.rf.gd/majikofamenap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d1a8a6-babb-4633-b558-da51ee26eb27/how_to_sue_someone_for_property_damage_in_south_africa.pdfIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_42708909a0434059b1289327c25eb197.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec9adf20-7b38-4401-a1cb-9bffc8ac4d13/jabodujinizer.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_1a96b519b767405b95c68f93c008c657.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/55981743272.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_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 5308 bytes
SHA-256: 344da4e3be56825c16e7f905e7673e3449a60f7be3d6add8fa6af550d1d5499c
font_01_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 10980 bytes
SHA-256: fd1bfc660167f9b28a0585bdc5c1ef4de1fa7114a1d0f264fdb5ec139ebbd89e