Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe3c98bee6b107b…

MALICIOUS

PDF

73.5 KB Created: 2021-03-21 00:34:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0e0c9b2fc38efaa1295c62e9c8e8b8ef SHA-1: 251e7297a9364796b6b23a98fd37a15a46fd9eb5 SHA-256: 1fe3c98bee6b107b18bb7df978be342cb955091ef45eb3f81540561faea61a60
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. The presence of numerous external URIs, some pointing to link farms on disposable hosting, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with a phishing lure designed to trick users into downloading a malicious payload.

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://golowaki.ru/award?keyword=ansys+14+workbench+tutorial+pdf PDF link annotation
    • http://weinmvc.net/warframe_solo_interceptionav939.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/jcjhZic/g_switch_3_plus_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiferufefu/hhiRJhc/38532890122.pdfIn PDF document text
    • http://topplafond.xyz/bovejewibebwb4w4.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/luihhbc/73751218701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_6051c677ecc36.pdfIn PDF document text
    • http://stav-games.ru/buketefamaturipenavozetuwumu5.pdfIn PDF document text
    • http://polypak.site/genie_model_7055_remote_programming4uxic.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/125174327233q7x6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471234/normal_5fedfb0cc078b.pdfIn PDF document text
    • https://cdn.sqhk.co/jataviwimog/janiagi/aflami_pro_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/ieZgfjc/55712545263.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_aa1ccbe7f9214ed38f9c8ce0fec58ee2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widofafane/66259766828.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/50265492429.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_7b9e55985e654a2d89964dea2db61b23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/tofizib.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_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 5768 bytes
SHA-256: 994dc9a418e88a035c0047b03cc9cdf98251dfe23275825f3d5e1c3c40dd2057
font_01_sfnt_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 11164 bytes
SHA-256: 27b3f4b65739ddbf00bc63b28c8ba98cae76b04cde828b1be803b52485378834

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