Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58affc7df26d7b3…

MALICIOUS

PDF

79.8 KB Created: 2021-04-16 18:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8321b63b7d86a5b4bf42bc6b4dc89fdc SHA-1: a1cb2c574805d2b17936aabbe54fd574f84fda9e SHA-256: d58affc7df26d7b32545acc4e7397c90d3d1085d501495e4ce41469b17b41024
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or link-farm-like services, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to wkhtmltopdf and date information, but no direct instructions or lures are discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=how+to+find+angle+measures+of+parallel+lines PDF link annotation
    • https://cdn.sqhk.co/mixaluwekitu/hfgdidW/80283849505.pdfIn PDF document text
    • http://lifeshop.pro/61351296709xszh0.pdfIn PDF document text
    • https://cdn.sqhk.co/nunexijezep/je0ianP/skyblock_mod_list.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/big_ideas_math_red_answers.pdfIn PDF document text
    • http://lufexaxoxak.mygamesonline.org/grammar_test_advanced.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/Sphid7p/zatugerisusuzofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_605100b15a6d9.pdfIn PDF document text
    • http://bomisedoxu.mywebcommunity.org/gitagovonakejaz.pdfIn PDF document text
    • http://motowifenizemuz.22web.org/76698561516.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/PAgicih/36513037868.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/hfsChhf/lolukikorinadodusufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454055/normal_603b5e8dc294a.pdfIn PDF document text
    • http://robolab.one/155666902485ysjo.pdfIn PDF document text
    • http://movikikigemalo.iblogger.org/33710201359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449421/normal_600e8c24bf7ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_604f52d718a95.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/yggAgcS/tarot_card_reading_for_beginners_book.pdfIn PDF document text
    • https://cdn.sqhk.co/laloropaki/geijMjb/tibipepadasugidebed.pdfIn PDF document text
    • https://cdn.sqhk.co/rudolikube/jieDrXC/bass_pro_shops_san_jose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_604603a38cc27.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/8Ljfghi/wings_and_rings_menu_somerset_ky.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fazegujopazoj.atwebpages.com/zewuvonapeb.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/zapixapodenopezizasiwona.pdfIn PDF document text
    • http://nosijatigatu.epizy.com/plagiarism_report_website.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_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 5416 bytes
SHA-256: c70210a8ad43a2dbfd79f12dbdd581496007dd13c75872696249c75438c1726f
font_01_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 11520 bytes
SHA-256: 6a49a2f2948004e9fd299d0ccaa083649a700fd131d621126c29a43045f8dd70

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