Malicious PDF — malware analysis report

Static analysis result for SHA-256 1535c8c6c2553f29…

MALICIOUS

PDF

77.3 KB Created: 2021-03-23 12:11:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 17606c0aa4e46ab645baccd5956edf1a SHA-1: 33107245bb45537f7e605e845ec0206dff55e13d SHA-256: 1535c8c6c2553f29698f5df7edc4cd0cfc298c746e7c8fd18011090f95ea7224
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, with one prominent URL pointing to 'resalured.ru', suggesting a potential phishing or malicious redirection attempt. The document body, though heavily obfuscated, contains keywords related to sales, which could be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/wix?keyword=south+american+snakes+for+sale PDF link annotation
    • http://milanomoda-italy.website/bukitiguxeliokdd.pdfIn PDF document text
    • http://allieshouseofhope.com/amd_link_connection_timed_out8eg8w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_601da42562fc0.pdfIn PDF document text
    • http://kazaxukiga.getenjoyment.net/82523174796.pdfIn PDF document text
    • http://hookup754.fun/danby_portable_air_conditioner_review_14000_btufz7u1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408462/normal_600e56e6ed5a1.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/87491322739y5r6v.pdfIn PDF document text
    • http://shoppermarket.online/gujuvediw8rth.pdfIn PDF document text
    • http://sibogufurab.medianewsonline.com/keto_diet_meal_plan_free.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/school_magazine_cover_design_templatest1046.pdfIn PDF document text
    • http://appeal-ig.com/somewhere_over_the_rainbow_ukulele_sheet_musicl6vdq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444114/normal_604218d49e424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_6026a46824747.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470542/normal_5fe551b50641a.pdfIn PDF document text
    • http://ylyn.ru/79453650350ayj4t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/40de2993-3121-4b4c-a37e-6043cf2631f1/esio_trot_film_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a95af7a-b7dc-4fd1-8186-ba14a31c3667/purple_cow_ice_cream_gluten_free.pdfIn PDF document text
    • http://zevusup.atwebpages.com/78519803424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a04028f-93eb-4873-9fa2-6f2d2d41a765/connect_epson_printer_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f20960-6365-43cc-98c5-fb2727a0f3b8/wafoketor.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/fifazixiw.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/duxoxef.pdfIn PDF document text
    • http://velelakolifuvu.onlinewebshop.net/47336199725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90164131-a23f-4321-b8a1-66d8db88c5b1/8006321515.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_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 5288 bytes
SHA-256: 3e9b097d98a6d73f46db541d6ed3f52fbe1c326e2826ac168796b26b015b7bf1
font_01_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 11208 bytes
SHA-256: b18f3f7a465ead06ded8f904c27bdd8682798fd823e9b87d79625ceb94d986b4

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