Malicious PDF — malware analysis report

Static analysis result for SHA-256 739f7703946fc414…

MALICIOUS

PDF

79.8 KB Created: 2021-03-05 11:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 26e09ced78503e7e7dd33c32230e27b7 SHA-1: a150da5076a652f5538478b0a8288ef75777d959 SHA-256: 739f7703946fc41460edbe74e5c2c085e545ad89377bba44b41bbf4ad433168b
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. It contains numerous embedded URLs, with one prominent URL, 'https://baarspo.ru/strik?utm_term=rug+doctor+how+to+use+hand+tool', identified as a potential phishing or malware distribution point. The document body, though heavily obfuscated, suggests a lure related to 'Rug doctor how to use hand tool', which is likely a deceptive pretext to encourage users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/strik?utm_term=rug+doctor+how+to+use+hand+tool PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370059/normal_602ae0c8214b9.pdfIn PDF document text
    • https://zanomegujinax.weebly.com/uploads/1/3/4/8/134873542/fametu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371248/normal_5fc78f144799a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379961/normal_5ffd47248f813.pdfIn PDF document text
    • https://cdn.sqhk.co/lifudidu/epSjb5M/gofifobepusixudisenaxu.pdfIn PDF document text
    • http://rodina38.ru/blender_eevee_contact_shadowsi4hwh.pdfIn PDF document text
    • http://pokupka.space/marvel_encyclopedia_updated_and_expanded9t3qa.pdfIn PDF document text
    • http://xasuxugadivusug.22web.org/drastic_ds_emulator_for_ios_free.pdfIn PDF document text
    • http://shop-profildoors.ru/422716276635kwlm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482882/normal_60273391cf8ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487201/normal_5fd05059a2aeb.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/eVYjdih/playstation_4_walmart_mexico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412170/normal_60153f791f516.pdfIn PDF document text
    • https://jekakakum.weebly.com/uploads/1/3/0/9/130969489/gosiju-kaninonovazon-woxumagomevin-tuzidis.pdfIn PDF document text
    • https://sosojisizavawov.weebly.com/uploads/1/3/1/4/131454692/3016762.pdfIn PDF document text
    • http://sellforce.ru/50788553761i3z9y.pdfIn PDF document text
    • http://55571.ru/80424876231ipu41.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/jgiicvj/10010936661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_601bab2aee658.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jepevam.rf.gd/20978875264.pdfIn PDF document text
    • http://ziresam.rf.gd/zeruba.pdfIn PDF document text
    • http://sowinoto.epizy.com/free_vocal_synthesizer_software.pdfIn PDF document text
    • http://luruloligof.rf.gd/boutonniere_deformity_radiology.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_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 5300 bytes
SHA-256: 701db9095a828917ab5b63ceb9e92bf4c41e3389fb6d0976479334b9728d3e9d
font_01_sfnt_off00010e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E16 10480 bytes
SHA-256: 8552fc2a1c3732c1d313042848cfdbaf6fb2b622695f25368e80afba79c25229

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