Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb86fe637770d491…

MALICIOUS

PDF

69.0 KB Created: 2021-03-22 08:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c571399b082f2c0aaaccb9ae801b18e4 SHA-1: 21cd29727f94a0c348bf42c2ffae44c1c1c666a4 SHA-256: eb86fe637770d491c6310539fd90598b594f02c1aecd5ca7507369148d283e76
126 Risk Score

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, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to search terms and PDF creation tools, suggesting a lure. The numerous embedded URLs, particularly those on disposable hosting and link farms, point towards a phishing or redirection scheme designed to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/award?keyword=atkins+fisica+quimica+pdf PDF link annotation
    • https://cdn.sqhk.co/xamitarerivu/fjfjigj/47782907169.pdfIn PDF document text
    • https://cdn.sqhk.co/rifomemi/gjTiajg/wirikivasosasige.pdfIn PDF document text
    • http://sunshop.pro/tosexexuxupojunekuxazqv43w.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/djiglih/celebration_castle_ludowici_ga_31316.pdfIn PDF document text
    • http://metazoaapc.fun/skyrim_another_life9zjbb.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/yziikgg/lutejufe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457006/normal_60035dfb21efc.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/can_you_play_sims_3_on_macbook_air_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375696/normal_603d8177affb2.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/3lieWKi/brain_it_on_the_truck_level_51.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/ihgfuij/folikigedagoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497395/normal_5fccf19341399.pdfIn PDF document text
    • http://organicnu.info/vazosugarajatupakituwu29cix.pdfIn PDF document text
    • http://gagefiwirimat.medianewsonline.com/animal_parasitic_diseases.pdfIn PDF document text
    • https://cdn.sqhk.co/norifasil/iYihuRr/49083605534.pdfIn PDF document text
    • http://tanivikovome.sportsontheweb.net/ay_sound_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478923/normal_5fcbb50b19c0c.pdfIn PDF document text
    • https://cdn.sqhk.co/piwizogir/ibji5ge/59110726162.pdfIn PDF document text
    • http://triple-doska6.club/1408676090331uk7.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://fegoluvarelewum.myartsonline.com/rectifier_circuit_problems_and_solutions.pdfIn PDF document text
    • http://viniwowosur.onlinewebshop.net/why_does_it_hurt_to_look_up_at_the_sky.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_off0000c595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC595 5008 bytes
SHA-256: c8aa76796578287f5f047dbe60f8680faf7ad246d21b5daec74913d5b2d55690
font_01_sfnt_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 9848 bytes
SHA-256: c73d9ce54ee84fadf71a2a4942d58e8ff5a1a74c0437b4cf4b62ea29f330b036
font_02_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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