Malicious PDF — malware analysis report

Static analysis result for SHA-256 22075addb91fe8f0…

MALICIOUS

PDF

77.9 KB Created: 2021-06-07 00:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d5f9045a06176ebd50cf8a0fdb81f376 SHA-1: 1288c1932d8c51a98dbafb54c0ae0ac557d5b6b3 SHA-256: 22075addb91fe8f05ee93f79b29de4d36d355124016111ed9c48a0ed824d72e1
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://huntic.ru/pbw?utm_term=ikea+smastad+loft+bed+with+desk+instructions PDF link annotation
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/116cbb485c7ef12.pdfIn PDF document text
    • https://tonavibete.weebly.com/uploads/1/3/4/7/134748981/goxara.pdfIn PDF document text
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/kuvobasavaponimefa.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4383681/normal_60b3b600e1b31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401517/normal_5fe40080afa5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474720/normal_60bd3a0aea3d3.pdfIn PDF document text
    • https://laputamobo.weebly.com/uploads/1/3/4/7/134763437/namege.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/856002c4-edb3-4e49-9a9f-267db2c1383e/75995864604.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/f/lanogubolosetugaditivor.pdfIn PDF document text
    • http://xosezoranad.pbworks.com/w/file/fetch/144610449/rush_royale_random_pvp_tower_defense_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45cbe9ab-3ac3-4fcf-92be-3cf8438fbe9b/when_will_new_yamaha_rx_100_launch.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144411648/butterfly_knife_part_template.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144574317/61584098955.pdfIn PDF document text
    • http://newubotadov.pbworks.com/w/file/fetch/144735834/how_do_you_cook_with_premier_protein.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4314a38d-1a21-48d4-ba0d-26abfb819732/kali_linux_update_command_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddbed15d-d7d0-4d0e-afd1-9bbf267b26c8/xoluzepagubedimewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/921d3ff2-edc2-4094-af5b-dab71c62d1a5/what_was_arnold_schwarzenegger_diet_70s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5262e14-e885-4bfe-b1a5-1f1a1a2c3255/edmentum_mastery_test_answers_precalculus.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/administracin_de_recursos_humanos_george_bohlander_scott_snell.pdfIn PDF document text
    • http://fipivuzigoge.pbworks.com/w/file/fetch/144424437/44774331479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7621d635-2f74-421f-9fb1-d454c39dbd7d/vofedose.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_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 5496 bytes
SHA-256: a9d738233e8e709e7d7809a639d3ae0af328dd247c75cb82714fe0541918de94
font_01_sfnt_off00010241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 12236 bytes
SHA-256: 40183cd9383a0b77eeebfe7d6df149ba0fab0e4d709d936c66d80f87d20d47e8