Malicious PDF — malware analysis report

Static analysis result for SHA-256 e372d0c96ced50c1…

MALICIOUS

PDF

79.0 KB Created: 2021-02-19 14:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f496d862e324b16fa01142acf44763cb SHA-1: bed0a0c6347b4efadd7d9976403cad1d56c91f09 SHA-256: e372d0c96ced50c1b8dcce0dadf4006a39d1eebabfb500d627b99735ca832454
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for SEO manipulation or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

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://jottigo.ru/wix?keyword=how+to+hack+choices+game+ios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422135/normal_60245773f0826.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_600416928079d.pdfIn PDF document text
    • https://cdn.sqhk.co/jalafimimodo/iaCWgdc/26949502949.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/hjEzIhj/wawasowojegixawunite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444626/normal_5fefa3a912caf.pdfIn PDF document text
    • http://jotisetafifuni.iblogger.org/kuxuvekim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452588/normal_60146af13fd12.pdfIn PDF document text
    • https://cdn.sqhk.co/bepoweruga/iaMquic/galaxy_infinity_alien_shooter_mod_apk.pdfIn PDF document text
    • https://sererewaxux.weebly.com/uploads/1/3/4/9/134903335/3571874.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/5346115.pdfIn PDF document text
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/96bc0abcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_600c98fe7db94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482406/normal_601742a6aea40.pdfIn PDF document text
    • http://suzuxef.22web.org/jesebesu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473947/normal_60073bb38c3ca.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/Ehdijjb/tor_browser_for_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391621/normal_5fff3f83252d4.pdfIn PDF document text
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/jubeweje_pugige.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/3560501.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lisodibediv.epizy.com/75720771238.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_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 5204 bytes
SHA-256: d5cf0c5b01d97aa5cd66974be25752d3a3ea1e109ad9b90ab5daaecdc03f4e6e
font_01_sfnt_off00010a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 10672 bytes
SHA-256: 1d7905fa4a27e377d5e553f53e5d7bd56f8e75b5c33add9faafc5dbc78c4a67b

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