Malicious PDF — malware analysis report

Static analysis result for SHA-256 3929c756f072fc2c…

MALICIOUS

PDF

86.5 KB Created: 2021-04-20 21:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d4aea03fab4dd678d94ca75873c2cdd1 SHA-1: cad174e7d3059f546df37983d4d45bb2f7a2d956 SHA-256: 3929c756f072fc2cf144491c83e02de0bc1c50e9d9ea201a704c7053aa92a95f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=what+are+the+6+extra+books+in+the+catholic+bible PDF link annotation
    • https://cdn.sqhk.co/puxedepobe/jjBaiaN/sudarinijun.pdfIn PDF document text
    • https://cdn.sqhk.co/pixanetu/8iih2cu/82372476450.pdfIn PDF document text
    • https://cdn.sqhk.co/jisogixij/jnhjhhe/fonatatasumezanox.pdfIn PDF document text
    • http://silewugebed.scienceontheweb.net/learn_south_african_sign_language.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/E9jh9hb/14141347294.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/ahhgYRc/zuwus.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/GhbjZNb/drive_simulator_2016_6_hd.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/71579055718.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/2017_ram_quad_cab_bed_length.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/what_is_spiritual_blindness_in_the_bible.pdfIn PDF document text
    • http://devuweza.scienceontheweb.net/blindness_saramago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/rokegoxosajuxiwega.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/78421571310.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/zukopaxujakefekikidez.pdfIn PDF document text
    • http://digadeliruzipep.epizy.com/weider_ultimate_body_works_exercise_chart.pdfIn PDF document text
    • http://xovizedi.rf.gd/fodomumikevewojufituliko.pdfIn PDF document text
    • http://tevefetilojas.atwebpages.com/epson_artisan_1430_inkjet_printer_canada.pdfIn PDF document text
    • http://wulogakuzi.rf.gd/catfish_farming_proposal.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/44984300530.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/how_long_to_cook_a_cup_of_rice_in_a_rice_cooker.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 5116 bytes
SHA-256: 5117e545cf1dad9c5eaa6440e4f0a35e9a94e6acd8ca9ee13ed6a44cadfc77e0
font_01_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 10820 bytes
SHA-256: 1d9b2c6acd4c51512e105afd4142153e129eaad9ab39e0c16e7914cc2b58f6a6
font_02_sfnt_off000128b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B0 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off00013ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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