Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e2035028235833…

MALICIOUS

PDF

77.5 KB Created: 2021-04-06 06:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bc23091147e68f3f0f09eb47d56add94 SHA-1: 68deabbec45da96b3cf5f38ca4448c93e18af11a SHA-256: 40e20350282358339296eba4d61d5a2ee9172d16b539f7a7ff127118c0a9ba17
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=honeywell+thermostat+manual+rth2300%252F+rth221 PDF link annotation
    • https://numuladak.weebly.com/uploads/1/3/4/6/134613837/jozusil-lenegetevoli-potivib-zaxozuto.pdfIn PDF document text
    • https://werakemil.weebly.com/uploads/1/3/5/9/135973214/1973461.pdfIn PDF document text
    • http://vashobereg.com/sufizudinajufemalotupkqwo.pdfIn PDF document text
    • https://sajadarazaga.weebly.com/uploads/1/3/4/3/134340855/zexejozuf-fufarivavefib-dukufuge-pejure.pdfIn PDF document text
    • https://vasigigu.weebly.com/uploads/1/3/4/6/134607878/juwejofamejuruziguj.pdfIn PDF document text
    • https://cdn.sqhk.co/detateseb/jricAvO/45008070283.pdfIn PDF document text
    • http://cleaner-inn.club/junipurobodiwamut49qv4.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/hgiQGQ7/defender_90_price_usa.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/philadelphia_eagles_injury_report_for_this_week.pdfIn PDF document text
    • https://vezitiratad.weebly.com/uploads/1/3/1/8/131856143/tufeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/a_court_of_thorns_and_roses_box_set_hardcover.pdfIn PDF document text
    • http://mipatupi.epizy.com/nautical_knots_wall_decor.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/irregular_verbs_worksheets_for_grade_3.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_50c6a616f44c46dda692c65a1c23ffe2.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_7ad44e3f94e941ffb7813a2350aa88bd.pdf?index=trueIn PDF document text
    • http://lerivazileki.epizy.com/ballet_dance_pictures.pdfIn PDF document text
    • https://42f4b946-f871-4f2a-a73e-6571c6569919.filesusr.com/ugd/e20521_a309b29ac739495ea9ca9f42f37fd0af.pdf?index=trueIn PDF document text
    • http://renawexit.epizy.com/76328257725.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_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 5604 bytes
SHA-256: 06b8395b2247b88e27f8e0c609a85b576b6966d6a66917444f0e5caddc358607
font_01_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 10872 bytes
SHA-256: a8b3067b399fedf41affbcb54c0dca4e195d0f21398e4fbf24ad41a1f454d217

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