Malicious PDF — malware analysis report

Static analysis result for SHA-256 08831d2f76c6c6a7…

MALICIOUS

PDF

84.1 KB Created: 2021-04-02 19:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bee9f08951523cbffd324738c535804 SHA-1: af0bb9e1ae28d60e36639cb8cf8a6ec3b611a0b1 SHA-256: 08831d2f76c6c6a7e86a372a712f6d5c96037f5bde81ff89d9f82e0e515b8cc6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious domains. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document. The presence of many URLs, including those on disposable domains, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jottigo.ru/aws?utm_term=the+paleo+approach+sarah+ballantyne
    • http://revilokepudidu.mygamesonline.org/35507034506.pdf
    • http://bestita.space/261591432618qe1w.pdf
    • http://vudipeledu.iblogger.org/23535999533.pdf
    • http://proita.fun/baby_yoda_name_grogu_pronunciationwkvm4.pdf
    • http://reduslimitaly.website/2501838701yvdbn.pdf
    • http://sevoxotedeki.medianewsonline.com/76502558496.pdf
    • http://mmuuue.space/apple_developer_enterprise_program_license_agreement_has_been_updatedlcrhq.pdf
    • http://parralax.net/83301907943xf2pp.pdf
    • http://excschool.ru/alter_ego_names_examplesz0f80.pdf
    • http://lnstagramcopyrigtservice.com/bituluxofemagewavi0tkiv.pdf
    • http://sudilufib.getenjoyment.net/28728539590.pdf
    • http://like-store.site/25592772956o4x1t.pdf
    • http://ch-data-2a8fv9s.pw/1913470098ldm6c.pdf
    • http://netewe9.xyz/ejemplo_de_acta_constitutiva_de_una_sociedad_cooperativa_de_producciond2685.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://forezepolutaju.onlinewebshop.net/indesign_reduce_export_size.pdf
    • https://s3.amazonaws.com/jivala/51632983874.pdf
    • http://xikisefux.epizy.com/fivigumonesejireri.pdf
    • https://s3.amazonaws.com/tuxexi/medegagegatoxuwugi.pdf
    • https://uploads.strikinglycdn.com/files/4027341a-54f9-4579-8c8e-b55f7739a49e/zefawu.pdf
    • http://werawepaloz.rf.gd/10397489035.pdf
    • https://s3.amazonaws.com/juliziwojatige/china_visa_online_application_form_india.pdf
    • https://uploads.strikinglycdn.com/files/dfa80907-a50d-4462-bd0a-cc64719dcced/15745612101.pdf
    • http://dosunadis.epizy.com/loi_binomiale_1ere_s.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b75.bin
bf0eef0fdf8cf1810163a3f9eff6b30bab31cfd8be3e0efdd3f7a9da0911850c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 5212 bytes
font_01_sfnt_off00011d29.bin
51c656cf55bed816b7672426d7522ced27344ef09d7606593df1d833bdb05672		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D29 11184 bytes

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