Malicious PDF — malware analysis report

Static analysis result for SHA-256 4030731dced87682…

MALICIOUS

PDF

81.2 KB Created: 2021-02-15 05:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f4bbe1d5b606817e591282b765ab90d2 SHA-1: 8b515c991003952189a1af8710f913c2cc72653d SHA-256: 4030731dced87682125cb88df106696225abcaf3a9f58f2c9f442c9b035c84e4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://druttle.ru/wix?keyword=saguache+colorado+pronunciation PDF link annotation
    • http://mabay.fun/fokotedawumft4zp.pdfIn PDF document text
    • http://groshyk.site/780633402642v4dk.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/HjmOWji/womafopevigozunej.pdfIn PDF document text
    • https://buwolerujagelav.weebly.com/uploads/1/3/4/5/134580081/nunuxowavaremalek.pdfIn PDF document text
    • http://brettlockhart.com/movie4me._com_bollywood_2019jodb6.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/CheHhbs/easy_whiteboard_drawings_step_by_step.pdfIn PDF document text
    • http://mgacessoria.online/71309234445ybogu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390056/normal_600326af2ea51.pdfIn PDF document text
    • http://neojust.ru/explain_cache_memorylvw9v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465249/normal_5fe20d4a784e9.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/potofaw/81886324907.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/dalvik_bytecode_editor_apk_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/16164647071.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/nekojam.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_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 5260 bytes
SHA-256: 5b1be32f61de722ec4dc039f27042fff612c61eb62fac5947d1ddaa468d51eb9
font_01_sfnt_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 11952 bytes
SHA-256: fde8876c4b5098df31d8ab9e0fa0bf8ae5098fc6e0ee2f76061cc97a4c3dc1b3

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