Malicious PDF — malware analysis report

Static analysis result for SHA-256 f330aac6fb3ec9b0…

MALICIOUS

PDF

82.6 KB Created: 2021-04-23 06:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4079f29fc8ef5eeaf2132d5eea56690a SHA-1: da0cdcc81bf18ad70fc083379f96c84b7ab6a3bb SHA-256: f330aac6fb3ec9b02fa4f866546b3fc4b7c2fc7029d7c9bb95ff1838c1472f2f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/strik?utm_term=will+homelink+work+with+liftmaster PDF link annotation
    • https://cdn.sqhk.co/kazakilen/ibiiAhe/xedumezubanotonobada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_6051f06b92379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450730/normal_6003960a1606f.pdfIn PDF document text
    • https://cdn.sqhk.co/sitosuduf/cjajamS/space_race_multiplication_math_game.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/nnjfgec/tajodewumenewikujexapa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488332/normal_5fd1c2fe095ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473963/normal_605f56c3e8dc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428039/normal_5ff3f1579da61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450506/normal_604305da1afc1.pdfIn PDF document text
    • http://dalnoboyi.xyz/what_are_some_adaptations_of_desert_plants_and_animalssbg3y.pdfIn PDF document text
    • https://cdn.sqhk.co/baxujebane/kc5jDXe/kewawotux.pdfIn PDF document text
    • http://kudusakepupa.sportsontheweb.net/chassis_design_principles_and_analysis_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_606a3560ac14f.pdfIn PDF document text
    • https://cdn.sqhk.co/merojuniv/eif9djg/cardiff_sixth_form_college_term_dates_2018.pdfIn PDF document text
    • http://xtw2.club/pudalowarr1017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488101/normal_602e60694488e.pdfIn PDF document text
    • http://dikoxikikalonib.scienceontheweb.net/temple_of_seitan_hot_ones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_60241bff41359.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_1662743a5b7140b5a1259072cbb9733a.pdf?index=trueIn PDF document text
    • http://livirava.atwebpages.com/62203387377.pdfIn PDF document text
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_5e7b0907611644718db9dcf3c58e701a.pdf?index=trueIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_b63c29a87e1c4e1e98e98f59c04afb6f.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_134feb773e704e029e1b6ca8816008fb.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_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 5176 bytes
SHA-256: 7e2b319ad8f3c79e07535a2c6bf63ffaaeca46125c2743a765d205e6b1f83f17
font_01_sfnt_off000114e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E1 11360 bytes
SHA-256: f3ac9008223ce64565de59ed8f9ec480c94469cc401814ed894630450e7b7b82

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