Malicious PDF — malware analysis report

Static analysis result for SHA-256 10dc51135e6f9e80…

MALICIOUS

PDF

70.1 KB Created: 2021-03-29 01:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6e85faa16d0776004655b515c4ad63d8 SHA-1: 886e840e95f44fdc37f9568a4ceb94710f4a6266 SHA-256: 10dc51135e6f9e8085f670e43bb0bb8dc60506ed0ecbb5298c4bf3783473cc28
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that mimic search results, specifically for 'Warhammer bestiariusz pdf download'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and a link farm heuristic further supports this, suggesting an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/award?keyword=warhammer+bestiariusz+pdf+download PDF link annotation
    • https://sekojeti.weebly.com/uploads/1/3/4/5/134583019/c050d4e892778.pdfIn PDF document text
    • http://ehaberdevlet.com/zazaneguzatevavajitijowj.pdfIn PDF document text
    • http://vashobereg.com/972078914501vcrm.pdfIn PDF document text
    • http://fotodosajube.22web.org/pikubegegepakezivawume.pdfIn PDF document text
    • https://donarebam.weebly.com/uploads/1/3/1/4/131453010/ralenuzaberefatowok.pdfIn PDF document text
    • http://ourfanz.com/910499717561wpcu.pdfIn PDF document text
    • https://tivuzukabatabab.weebly.com/uploads/1/3/1/4/131405927/nawoziruv.pdfIn PDF document text
    • https://zomuguwiremadak.weebly.com/uploads/1/3/1/4/131406071/misuzalepi.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/arris_nvg589_lightslqlys.pdfIn PDF document text
    • http://pasetbs.xyz/pumptrol_pressure_switch_9013fsg2m4xfugi.pdfIn PDF document text
    • https://gumewixolasadaz.weebly.com/uploads/1/3/4/6/134659592/mozimuk_jexaladi.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/jovekus/brother_hl-2280dw_driver_for_chromebook.pdfIn PDF document text
    • http://wowupopokidejol.rf.gd/29704032367.pdfIn PDF document text
    • http://sewoxoxitif.rf.gd/6791132925.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/65972976802.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/balancing_equations_practice_1_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/56434789775.pdfIn PDF document text
    • http://vuruwabudakase.epizy.com/41034060928.pdfIn PDF document text
    • http://nadusapawamuj.epizy.com/nosobodekukeporexexufes.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/rexulolovewamavujiliwuv.pdfIn PDF document text
    • http://vokerajud.epizy.com/binary_code_worksheet_middle_school.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_off0000d324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD324 5576 bytes
SHA-256: 20bc4680ae1c7097a55ea5abbe01667fab3246db3157c486290d707ef7e37204
font_01_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 10904 bytes
SHA-256: 9806e070fd99b33a5fc13ee7c61b4289771f62df40cd5812023eff5592bfc32e

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