Malicious PDF — malware analysis report

Static analysis result for SHA-256 762a7436fcdbbb8f…

MALICIOUS

PDF

75.8 KB Created: 2021-01-31 21:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a85772b0fa82d34a9538eea2eec24f4e SHA-1: 2a5ea5349503995f75a2b37dc10120bf8bf80b12 SHA-256: 762a7436fcdbbb8f19c1b75073415d29f78ac114b01583574fd2317f7e438cdc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=vocal+remover+free+software PDF link annotation
    • https://cdn.sqhk.co/desogepupema/4EifhbV/how_to_make_origami_animals_out_of_money.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/Fjbjgg1/sezipaxobadefidomena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501029/normal_5fd678c93c23f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404310/normal_5ffac7d6c705c.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/ajjNiaA/hair_salons_near_me_open_monday.pdfIn PDF document text
    • http://jakivuxevova.22web.org/musomogikivowub.pdfIn PDF document text
    • https://cdn.sqhk.co/nezotelo/jbjjahb/26706360213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_600f44093e83e.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/ayo_and_teo_last_forever_mp4.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://popedufi.epizy.com/best_hd_cool_wallpapers_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/mewifewezem.pdfIn PDF document text
    • http://wefofumerari.rf.gd/34444583513.pdfIn PDF document text
    • http://vikoxip.rf.gd/90871130944.pdfIn PDF document text
    • http://jawegoxizifiti.epizy.com/dagijusodetofo.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/kituzipojujiboxozajus.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/jisalasirakelupefox.pdfIn PDF document text
    • http://gusozafameximi.epizy.com/apache_flink_for_windows.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_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 4776 bytes
SHA-256: ad542ff05515f32e246b150bf0c43d3e4ad99341c75e2c6e6eae2f54f8dfc378
font_01_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 10648 bytes
SHA-256: 2476bb2c548c4b2bbf4c187c97615ca478ad4658fbe50ded6a714108d709b1e8
font_02_sfnt_off000113f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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