Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a784b749f12e7f…

MALICIOUS

PDF

77.1 KB Created: 2021-03-02 01:06:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 7175ab528ee4513a3ff01ae7a570f797 SHA-1: 61c02ee07e5cbcd90d1f0bf1c43f47b0e9be5cc4 SHA-256: 12a784b749f12e7fe016c7365f1e1264912edbac61a62c9d4298ec25429fcb9c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to suspicious domains, indicating a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=roku+ultra+2020+vs+2019+reddit PDF link annotation
    • http://easy-money-cash.space/pumpkin_coloring_page_templateifzqb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369146/normal_5ffa7ae707ef3.pdfIn PDF document text
    • http://leopolds.space/ge6075_professional_ethics_in_engineering_book_downloadewyvs.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/8UDgQMX/animal_forest_fuzzy_seasons_mod_apk.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/duxusuhb247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_603a8a3ce5625.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/CRjggfN/77485999654.pdfIn PDF document text
    • http://9gusevshop.website/72476425153p9a98.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/L05haEe/56330376355.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/iaIbhgM/elements_of_art_texture_pictures.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/1977_dodge_sportsman_rv_engine_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/fhidSEO/rasapewunamolemawapori.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528780/normal_5fde2dcbc43e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414514/normal_603d7227d7cd7.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/d3thcig/banana_kong_2016.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/11260486011.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/Jjihdg6/14452599345.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
    • https://s3.amazonaws.com/fusidejebi/67588491487.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 5208 bytes
SHA-256: 681653761c20b1653822467d0619094c508c88af9799a0969e41d44fc1fe9a7a
font_01_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 10540 bytes
SHA-256: 60377534688c472a9ca58eb4c7b796700e9d60d707e1c85944597985f4b96efc
font_02_sfnt_off0001191f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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