Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d13acf02dc1cff9…

MALICIOUS

PDF

73.4 KB Created: 2021-02-25 19:08:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7685b8bc5646cd0fdb41a2b1df634deb SHA-1: 2ea2c8ba2388a2c01483c9797f90a494115e03c2 SHA-256: 1d13acf02dc1cff9a63edf25a841802ee3203ecc333aebe2dde0db67be5018ce
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to legal advice, likely intended to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://bologen.ru/wix?keyword=how+do+you+write+a+character+letter+to+a+judge+before+sentencing
    • http://wotidoteked.mywebcommunity.org/rofawewazo.pdf
    • http://pogawubujogeje.mypressonline.com/17364531328.pdf
    • http://nigavereke.mygamesonline.org/mubuxemapejezaxita.pdf
    • http://nopotaz.medianewsonline.com/olive_oil_soap_chemical_formula.pdf
    • http://forexgeeks.net/etiquette_of_marriage_in_islamkh47d.pdf
    • http://fasekafalig.scienceontheweb.net/why_does_emma_bovary_kill_herself.pdf
    • http://xoziduso.mypressonline.com/signos_y_sintomas_de_enfermedades_del_sistema_endocrino.pdf
    • http://xejopegig.mypressonline.com/bidujulunojosujodikap.pdf
    • http://lofajemami.sportsontheweb.net/89652385728.pdf
    • http://mmamba.ru/adverse_event_adalah0ft6b.pdf
    • http://ellmax-site.xyz/xivatodidsysqy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ganubatebedoxez/academic_calendar_template.pdf
    • http://zijiwaras.onlinewebshop.net/how_many_calories_in_a_fried_tortilla_shell.pdf
    • https://s3.amazonaws.com/lakadutof/fefiguzoze.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_off0000e251.bin
cc69bb6f09c733778f32a5be3cca2b83ed0e710535de4670154c4b5b976321b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 5652 bytes
font_01_sfnt_off0000f5a1.bin
1331a02fef0fe4cbff102c2b77a7a45d7829ada2d84e499aa93740518df93fc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 10160 bytes

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