Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c844819acbbc51…

MALICIOUS

PDF

96.6 KB Created: 2021-04-08 07:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f6cd166c0c58828b95530f71a9cb4bad SHA-1: cd0b680429c55487b945b2ece710cadb63874089 SHA-256: 27c844819acbbc5190e32d5e81926cf0498ded22193bbf1555f974632b152083
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 contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to redirect users to other sites, potentially for credential harvesting or malware distribution.

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://bologen.ru/123?utm_term=idle+heroes+guide+tech PDF link annotation
    • https://cdn.sqhk.co/nutewakizi/jbujjdb/blank_swot_analysis_template.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/iedkjg9/download_mountain_bike_xtreme_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/qOidKIE/13701027652.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/fgehdhj/tunabowuzetowibiterota.pdfIn PDF document text
    • https://cdn.sqhk.co/morovujefi/ibifjdk/82385792038.pdfIn PDF document text
    • https://cdn.sqhk.co/xisusituz/hnWAjgI/avid_media_composer_plugins_free.pdfIn PDF document text
    • https://bizevino.weebly.com/uploads/1/3/4/3/134320064/3605f.pdfIn PDF document text
    • https://cdn.sqhk.co/fazejitev/yzTiejh/minasuginifame.pdfIn PDF document text
    • https://xilasofuvi.weebly.com/uploads/1/3/4/6/134651230/gubewota_jodolavifaba_bonid_fokoniledoroz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_0c214e1c29f848c48a75f83421ce4b86.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_af0aa7abf3ea47cdb14c9aa78ca18f1e.pdf?index=trueIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_0a7c73226cf6492586e98400bd37fda7.pdf?index=trueIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_85a38ecb071e457eb694b5c8d9652ef2.pdf?index=trueIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_eeab9d9d7a93462e8436cf74a3bc41e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d55125-2352-47ed-b244-9dc5e44d335d/batman_the_dark_knight_returns_part_2_latino_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/959383ae-089a-4a77-9124-19d7e7a8e258/63137282205.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_275e24a3f97246c0acffbc4bb148e35e.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CB 4928 bytes
SHA-256: c46014b4513c234419d4a2d8e5665ca1a3061126afe47c6fda855a6df88364b9
font_01_sfnt_off00013989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13989 11292 bytes
SHA-256: 1b3dded122c8cacf7681080084b3d8fd19f89f568dbb19194be3145281ef3a85
font_02_sfnt_off00016033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16033 16156 bytes
SHA-256: 1971659e14f72c8e307762b78aff232f1163dd334a005ced8803d8fee631f5f5