Malicious PDF — malware analysis report

Static analysis result for SHA-256 995a943eec87d89a…

MALICIOUS

PDF

61.7 KB Created: 2021-02-05 05:18:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 24043ce557250d31dc63800231bf02eb SHA-1: 1529b0892b2aad54444724feeb957e54148281f7 SHA-256: 995a943eec87d89a28968140695f70717a7d339aab2f1c9623bee7db69bfef5c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The embedded URLs likely lead to malicious content or phishing sites.

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://baarspo.ru/aws?utm_term=vaastav+ganesh+aarti+song PDF link annotation
    • http://digitalmedialit.com/dell_optiplex_780_sff_cpu_supportzw3xh.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/S0jjwKP/animal_in_the_room_app.pdfIn PDF document text
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/3462772.pdfIn PDF document text
    • http://wukosemat.22web.org/third_person_shooter_android_offline.pdfIn PDF document text
    • http://lazadacostumercenter.com/7342203487poo5d.pdfIn PDF document text
    • https://cdn.sqhk.co/nedivixozu/iPgjJib/duximejorofilavelufon.pdfIn PDF document text
    • https://pafabori.weebly.com/uploads/1/3/5/3/135317136/8826006.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/eamidhc/1737866559.pdfIn PDF document text
    • https://cdn.sqhk.co/pidagasew/XiUSigJ/26641735944.pdfIn PDF document text
    • http://bigwin-1xbet.fun/81040878656pu77o.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxeneson/djfUmgg/digomanipina.pdfIn PDF document text
    • https://vumimexuderuwaz.weebly.com/uploads/1/3/1/8/131871863/4923ec.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/ximupuv/rekimetefetudixofufowapiw.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/bhoothnath_film_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/architecture_patterns_in_android.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_off0000b3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A2 4940 bytes
SHA-256: 01234077ca40a2b834f0819e3deb4a6f416d12d9f5c2df6a2d4bf0a1c27c5ab2
font_01_sfnt_off0000c477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC477 11248 bytes
SHA-256: 7cc4d0f44678e25a6a6a29ea26caed02fa2dea9f1662027fae7cb471b91f9fd2

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