Malicious PDF — malware analysis report

Static analysis result for SHA-256 09834ef0291482ac…

MALICIOUS

PDF

83.4 KB Created: 2021-04-06 04:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d6b065b3abc5b277ead5d3fa8176a51 SHA-1: 15bf9c20c9e92c874f06c3652f3f28557da31711 SHA-256: 09834ef0291482ac1d14cfc069ddd0e92dca1c4a100f2249e06ee92ac08d2149
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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.
  • 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 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://ponafet.ru/award?keyword=articles+usage+rules+pdf
    • http://nosatines.mypressonline.com/mufutigazerekudezujofub.pdf
    • https://fafafupoxojamu.weebly.com/uploads/1/3/5/3/135350358/vesuworebopo.pdf
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/3936063.pdf
    • http://ayazshabutdinov.club/how_to_use_instant_pot_duo_nova_pressure_cookgpw4z.pdf
    • http://info-pages.ru/accepting_a_resignation_template5z3ht.pdf
    • http://vopugixeroramox.medianewsonline.com/baudelaire_the_painter_of_modern_life_and_other_essays.pdf
    • http://idealica-official.website/resitiwijopomuwezage1zpt9.pdf
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/nomimevaputimuxab.pdf
    • http://lazadacostumercenter.com/42964654062rmidy.pdf
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/zamefodon-gogar.pdf
    • http://tonagruz.ru/nfl_week_7_predictions_2018_bleacher_reportcoyzu.pdf
    • https://kagodititaf.weebly.com/uploads/1/3/4/8/134868324/41e6face3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/84582d6a-1618-4492-85f8-de7eba912762/74904299452.pdf
    • https://f8206d31-21c4-4aef-9da9-e4259ded718a.filesusr.com/ugd/c2bdac_a2dbb67d224a42c898b2ff3e9cf2370d.pdf?index=true
    • http://jumepenitujox.atwebpages.com/example_of_reaction_paper_in_apa_format.pdf
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_ebb1c19ee7fc4a88a8ed8c0181cb7459.pdf?index=true
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_68434b7bbfae417f8c624a1a00af90ac.pdf?index=true
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_d9f71e08616f401fabc91798c0a3076b.pdf?index=true
    • http://molagegivijoxu.onlinewebshop.net/vojolemiruv.pdf
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_42c0374b77324482a963c8be51809594.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b35d8bd4-85e6-45bc-93b4-32a3f05f68bf/hibernate_tutorial_java_code_geeks.pdf
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_cd320b7874d24ee59618fe069b4d060d.pdf?index=true
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_f64373a9697e409b87c1c3e8e04834d9.pdf?index=true
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_e2a148a31338453cac5113c6b8a2319f.pdf?index=true
    • http://neketepa.myartsonline.com/53956073099.pdf
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_25d92207961e460e94415dccca03182f.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcbf.bin
755cd82b25e436b39aa7bda867ad9b4f809216f698841fa177f136719c7685a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 4980 bytes
font_01_sfnt_off00010dc4.bin
6142f2b7a87e6ee34d11e6441efd88ea49c35a73876ba892b46099be806fefdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 10576 bytes
font_02_sfnt_off000131f4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x131F4 4324 bytes