Malicious PDF — malware analysis report

Static analysis result for SHA-256 11eb35967e4b2736…

MALICIOUS

PDF

84.0 KB Created: 2021-06-13 07:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8a59acef9352bf3c35da7821ea197f0b SHA-1: ca387b1fa4e8473012bc08294e41c4bf25890822 SHA-256: 11eb35967e4b2736ae1753a3c6dded0cf9d3dc1c5f49eaf5e6c067e4d2c3ee31
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 0.9997

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://pixomot.ru/pbw?utm_term=bsc+software+engineering PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401732/normal_602239fc7e1a3.pdfIn PDF document text
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/kirefumajevoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_60559a60cf9d2.pdfIn PDF document text
    • https://loboweron.weebly.com/uploads/1/3/2/6/132681880/tatipebunimob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417049/normal_60ba04dda1129.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368244/normal_5ffba69e76b24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369189/normal_5ff13e395269d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481552/normal_6065338433e80.pdfIn PDF document text
    • https://lelejijavifol.weebly.com/uploads/1/3/0/8/130874253/ravatukogozofimat.pdfIn PDF document text
    • https://fiwujewi.weebly.com/uploads/1/3/0/9/130969997/xegalinaxawezow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_60434eb00a451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473049/normal_5fd21972ce00c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_6066ec29f20b0.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/4693268.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/354cf479-272d-4938-91da-dd7c2a551c45/viking_stove_repair_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f864864-b7b2-4290-8e26-e73b95fd0a0e/club_cards_in_a_deck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97dd898c-9e18-4480-aeb7-9d756863a20f/womens_family_roles_in_the_1930s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a35598-1c8c-4486-9dc5-a0079962a489/monaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a456dad-d6cd-47ca-975f-deaba1f5bf90/sewutajupeduzuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90fc1828-269a-4ac6-853f-d46530063337/how_much_does_a_playstation_3_controller_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d9c4dd-1b9a-484c-b5fa-b849a294f1ea/present_progressive_verb_tense_definition.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_off00010a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 5156 bytes
SHA-256: c66c8f93304ec244d9f6cafcf8fd1939c7b2cfa8e1b001754c6db1d26d83a2eb
font_01_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 11044 bytes
SHA-256: 1e8ba283b9d48848644d3d9ed5e99f4b5124cc7890d700b8bb730caae5e17e43