Malicious PDF — malware analysis report

Static analysis result for SHA-256 973bd49639fe35f9…

MALICIOUS

PDF

104.7 KB Created: 2021-03-10 02:11:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 392f2dc2f75c3e43068a60858b8e486f SHA-1: b4cd2b64e94261ed16a527b5487acf6b08845515 SHA-256: 973bd49639fe35f9e9e91dd618859f0e1376df9bb0f36a5b518a58e30b5bc7eb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and link farms, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to wkhtmltopdf and creation dates, consistent with a generated PDF used for malicious purposes.

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://crophysi.ru/strik?utm_term=why+was+the+agricultural+revolution+so+important PDF link annotation
    • http://online-sistem.site/fexixubivazinilufofubiwlk79o.pdfIn PDF document text
    • http://flowerport.shop/54585529825f17ro.pdfIn PDF document text
    • http://registrat.space/patient_safety_leadership_walkrounds_guideuci75.pdfIn PDF document text
    • http://bigmagazin.xyz/walgreens_fingertip_pulse_oximeter_reviewsjqevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_601477d31edd6.pdfIn PDF document text
    • http://urott-hu.com/meal_plan_template_doc978wz.pdfIn PDF document text
    • http://getcreditreport.info/libepumomox4tcan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476445/normal_603e7dc1d5995.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/aChbjg8/time_idle_rpg.pdfIn PDF document text
    • http://it50disconto.pro/how_to_charge_sony_dsc_h300e6d6j.pdfIn PDF document text
    • http://strahauto.website/25529861449a6n8e.pdfIn PDF document text
    • https://cdn.sqhk.co/kotolodegag/hhVCtw6/2005_carson_fun_runner_toy_hauler_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/mljj1jh/craftsy_type_websites.pdfIn PDF document text
    • https://cdn.sqhk.co/texekikevow/XrZw6aB/resinusepapetixarepuwavi.pdfIn PDF document text
    • http://poroda.site/tevisojojarnogpc.pdfIn PDF document text
    • http://savadaqwe.space/938736608995dkyl.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/uTEsibS/gegibaganoboti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5fd1e0be0a4f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_5b15176d42a94de08296a8f60cac08af.pdf?index=trueIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_e5f65ab5e7be440190757e89561f8cc6.pdf?index=trueIn 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_off00015c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C4A 5616 bytes
SHA-256: 3a020a26b89a1b6ce35de6b759d76af1a107ffb320c4e3023d087d569f01d8ea
font_01_sfnt_off00016f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F65 11208 bytes
SHA-256: 9bb7cb3e75c11b051b9bc5ca544c1a1e5a23d4e731d89e0038f91f19389bdeeb

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