Malicious PDF — malware analysis report

Static analysis result for SHA-256 588aa78183ce81aa…

MALICIOUS

PDF

104.5 KB Created: 2021-02-18 15:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: eaff8d2d56cda7059627cac47bdd4033 SHA-1: d0c1f023dc18dc8d0e55e426436b61e6817c58db SHA-256: 588aa78183ce81aad653e7292cec6a8a21a640eb62e8f0c2cb05006fe0e367e2
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to a specific firearm, likely used as a lure to direct users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=remington+870+express+tactical+28+inch+barrel PDF link annotation
    • http://dasaburaxad.22web.org/tipos_de_anomalias_congenitas.pdfIn PDF document text
    • https://mapaforidax.weebly.com/uploads/1/3/4/0/134012560/tetulusapasexarudiwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374976/normal_5fe453b5f1f3e.pdfIn PDF document text
    • http://aarbuz.space/fasutuc7pk1.pdfIn PDF document text
    • https://zuparimetusu.weebly.com/uploads/1/3/1/3/131378993/0fc4542dd5.pdfIn PDF document text
    • http://mesugowogidevik.iblogger.org/flirty_would_you_rather_questions_for_him.pdfIn PDF document text
    • http://springwin.space/90563894005mewus.pdfIn PDF document text
    • http://boost-shop.xyz/319309804911bdsn.pdfIn PDF document text
    • http://idealica-italiaofficial.site/18619816082l8r29.pdfIn PDF document text
    • http://mebel-albero.ru/cup_of_jo_toddler_gift_guidepszet.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/sirilagewuga/jipulapirikidawez.pdfIn PDF document text
    • http://fevufubot.rf.gd/libubumodazamaxu.pdfIn PDF document text
    • http://xatosizukav.epizy.com/ff14_marauder_class_guide.pdfIn PDF document text
    • http://tuxusar.epizy.com/97014095045.pdfIn PDF document text
    • http://juvadapirepaf.epizy.com/kujidukexa.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/kotusikitulovud.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000142ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EE 6108 bytes
SHA-256: 2e985d5cfa68da5000e525aecd7fcc643b7cb126007615380a70847026e58c0d
font_01_sfnt_off00015795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15795 12196 bytes
SHA-256: a98e20c17302a44b920ac60786c1b98395d3b20ab3aef5bfba3994c0703644f8
font_02_sfnt_off00017f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F8F 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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