Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99dcc05b7de65d2…

MALICIOUS

PDF

75.3 KB Created: 2021-05-15 18:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e001ce08c7d14d57532d378c4c8ce452 SHA-1: dd9829933f663f9b93225ad4b10648dc5d34f5eb SHA-256: d99dcc05b7de65d25eb739b4fa4dd5319d04b150c68b065db1953275afcbf813
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to a disposable hosting domain, which is a common tactic for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Kallax unit assembly' and the authoring application, suggesting a lure to trick users into visiting the malicious URL.

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://vilenefex.ru/strik?utm_term=kallax+unit+assembly PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392441/normal_600f1cf461b24.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/heFhgbM/the_factory_restaurant_jersey_city_new_jersey.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/acihDhh/word_jumble_puzzle_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456379/normal_601b53f0acfb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488135/normal_60062666c54cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459164/normal_602a324b61c84.pdfIn PDF document text
    • https://cdn.sqhk.co/xawesani/wjhBg4T/craftsman_gold_6._75_lawn_mower_190cc_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469837/normal_602689675892f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_603eb3322faea.pdfIn PDF document text
    • http://zaxanoxejem.iblogger.org/39132604714.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/fagusumazot.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/reliance_industries_balance_sheet_2016-_17.pdfIn PDF document text
    • http://dojeranorered.epizy.com/gajugabujenijunogotiz.pdfIn PDF document text
    • http://tutanimonuwodam.epizy.com/different_types_of_exception_in_java.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df8905c-3e7c-481a-b2b8-8516cc32397b/why_is_my_sony_tv_blinking_red_4_times.pdfIn PDF document text
    • http://nemunuj.rf.gd/71863112025.pdfIn PDF document text
    • http://jedovimesize.epizy.com/litterature_africaine_negritude.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/backpacking_checklist_template.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/what_are_the_colours_of_the_halogens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c94122-0cc4-473e-aaf5-2cce64ca1815/shure_slx24_beta_87a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 5012 bytes
SHA-256: 5625f3eb92b2f678bc5f5090fbb8616ba333031f6ba36fd58e9c205525f1cce3
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 10528 bytes
SHA-256: d8a00ed0149c50aeb21af5b19c7a25a1563977ea0def8b1985a567c968eaa562

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