Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65ca280ca6d8c47…

MALICIOUS

PDF

86.8 KB Created: 2021-03-18 11:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 84b16e6f05347be19abb9d0a9fddebe0 SHA-1: b75e4de34931a45dcd1e4ee4a00fc4caf60837a0 SHA-256: c65ca280ca6d8c479b4f3aeda16408069c574e5289251370b9d54326ea104f93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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/wix?keyword=allyn+bacon+guide+to+writing PDF link annotation
    • http://homearfes.com/42270503229o6f9r.pdfIn PDF document text
    • http://thefortykuti.com/levativaminajakipojuddyzde.pdfIn PDF document text
    • http://fukijuwevo.getenjoyment.net/how_to_write_a_critical_review_of_a_research_paper.pdfIn PDF document text
    • http://laludinemolat.sportsontheweb.net/sinemizevuvik.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/22392371772.pdfIn PDF document text
    • http://fruittea.space/baby_hazel_cooking_gamesb9jpn.pdfIn PDF document text
    • http://bonboxstudio.com/the_magic_of_belle_isle_summaryu1l65.pdfIn PDF document text
    • https://zemojedi.weebly.com/uploads/1/3/5/3/135333580/ea29c7ea34e53.pdfIn PDF document text
    • http://usesol.xyz/2754231337038he2.pdfIn PDF document text
    • http://dom-bita.org/kibifemuge3zdul.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/what_do_circuit_symbols_mean.pdfIn PDF document text
    • http://arfeshome.com/guredetavm1q9r.pdfIn PDF document text
    • http://arthromedro.xyz/toyota_forklift_replacement_partsaxvx2.pdfIn PDF document text
    • http://kindraretterath.com/3300991022085pyh.pdfIn PDF document text
    • https://kezarixanutoge.weebly.com/uploads/1/3/4/3/134372428/851acd52cdc.pdfIn PDF document text
    • http://sk-anker.ru/dir_615_router_resety7tza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/patterns_of_enterprise_application_architecture_fowler.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/stairway_to_heaven_korean_drama_park_shin_hye.pdfIn PDF document text
    • http://gitodake.myartsonline.com/41794780385.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/britannica_great_books.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_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 5252 bytes
SHA-256: a164224116def2f76aee495195b0a8b8f2c0e411ca76145109952c89c50307e7
font_01_sfnt_off000125c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 11244 bytes
SHA-256: 077aaa9c93720eefe9575d3ccfd9fd86e945d1025ae5a789d09c49324b03df05