Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7501b99391856c…

MALICIOUS

PDF

76.6 KB Created: 2021-05-04 01:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 512bfd073ac203bd04ad4e9edf5eae90 SHA-1: 73a9740b607bf6ec1bf7e529f74f55487c79dc1e SHA-256: bb7501b99391856ccef184a0454c386d108a54179dac8eb042e2f3a15e88af3e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to tablet resetting, suggesting a lure to a phishing or scam website.

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://zajinet.ru/strik?utm_term=how+to+reset+yuntab+tablet
    • http://sitebomobegux.sportsontheweb.net/71968214216.pdf
    • https://cdn-cms.f-static.net/uploads/4365552/normal_601ed69ec6a34.pdf
    • http://copyrightnotice-ig.com/lavuzazewos7t2zf.pdf
    • http://swiss-gear.shop/what_is_a_health_psychologist_ukduqc8.pdf
    • http://tujemet.scienceontheweb.net/75549526486.pdf
    • http://pifedalune.medianewsonline.com/appellate_jurisdiction_of_supreme_court.pdf
    • http://store50off.info/xafonipofojuxea0yqu.pdf
    • http://dvestideyli.xyz/dnd_5e_critical_hit_buildcy4d8.pdf
    • https://cdn-cms.f-static.net/uploads/4408485/normal_604fd185f1428.pdf
    • http://medebupima.sportsontheweb.net/possessive_pronouns_worksheet_4th_grade.pdf
    • https://cdn-cms.f-static.net/uploads/4473903/normal_605f936a2bbc4.pdf
    • http://m-ryanaf.site/how_to_replace_trimmer_line_on_craftsman_gas_weedwackerxecc1.pdf
    • https://cdn-cms.f-static.net/uploads/4464877/normal_606d660769db4.pdf
    • https://static.s123-cdn-static.com/uploads/4422893/normal_5fcf3e2819043.pdf
    • https://static.s123-cdn-static.com/uploads/4491175/normal_5ff71aeec82aa.pdf
    • http://tumbaa.space/davis_drug_guide_online_discount_codelal50.pdf
    • https://cdn-cms.f-static.net/uploads/4477147/normal_6031681b9fe88.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://toxodetu.rf.gd/how_to_change_a_hot_water_heater_in_a_camper.pdf
    • http://xevijojikutep.onlinewebshop.net/branches_of_accounting.pdf
    • http://sopudekazulute.rf.gd/12783735933.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee81.bin
57d4672454dcb6ce00762c3ffb91b3285261438c7fe40c679f286552e0d6c765		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 4972 bytes
font_01_sfnt_off0000ff8c.bin
c5821d649b179fee9ccc88764e40facaf3d5c1f7ac14105d23a4a2a27686a986		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 10660 bytes

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