Malicious PDF — malware analysis report

Static analysis result for SHA-256 720c998a7adc6c31…

MALICIOUS

PDF

101.5 KB Created: 2021-02-26 07:34:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 444c41d05717b1e8ffd6e49ba4400e48 SHA-1: dc2b40ed88f86a5062a5820f30f114c3fc681f0e SHA-256: 720c998a7adc6c317790f3b7aa6d20f778a345e37de3feb956135ce2fc123cd9
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirectors. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous links to disposable hosting and a specific malicious redirector URL suggests the primary purpose is to redirect users to phishing or scam content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=is+genius+genetic In PDF document text
    • http://lezigovedavide.getenjoyment.net/boss_br_900cd_review.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/dunurununotoxu.pdfIn PDF document text
    • http://devicesprotectionforusers.site/2455751168f0zca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_60377eb549bc7.pdfIn PDF document text
    • http://unreguezff.rest/41684903096h42s2.pdfIn PDF document text
    • http://lngcliente.com/electrical_drawing_symbols4xbgt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404500/normal_60062073678a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_6019b7afccbed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450724/normal_5fe3a3c385329.pdfIn PDF document text
    • http://55571.ru/99098234020ir58y.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/dewazewokib/meditations_on_the_tarot.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/giwinizaxafujup.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/pisugo.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/what_types_of_intermolecular_forces_are_present_in_ammonia.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_off00015241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15241 4564 bytes
SHA-256: 606512bb2e2ca0c1a714bb6d88056057ab28865913d884b3c2264e9e76f9c414
font_01_sfnt_off000161eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161EB 12208 bytes
SHA-256: 2b9dc6d7d22c3ee939eb5dd852207727cb6c2904f2090ba7f91e6b6c13b9797b

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