Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a52248fcf6cd7d…

MALICIOUS

PDF

79.4 KB Created: 2021-03-30 02:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5f43d085156a1b65f4de1356bdc834cd SHA-1: 178cb621a19ad0a9408cf99eac158b8658ff3c12 SHA-256: b8a52248fcf6cd7de1cfa12aa4acc6b11a45078b3b1487e0da594663839da2d1
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 pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic of using link farms on disposable hosting to obscure malicious intent. The document body, though heavily obfuscated, contains text related to 'kjv bible study questions and answers pdf', suggesting a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/award?keyword=kjv+bible+study+questions+and+answers+pdf PDF link annotation
    • http://xikapajami.mypressonline.com/breve_storia_della_letteratura_italiana.pdfIn PDF document text
    • https://cdn.sqhk.co/podadoxafa/lLx3otz/dusarit.pdfIn PDF document text
    • https://cdn.sqhk.co/bulelovuroga/ibNeJge/53035865311.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/iUr2Tgg/85203204918.pdfIn PDF document text
    • http://paxezimusosesa.scienceontheweb.net/pefofag.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/17874424419.pdfIn PDF document text
    • http://padapup.iblogger.org/what_level_of_math_should_a_4th_grader_know.pdfIn PDF document text
    • http://duwelizub.mywebcommunity.org/54957772214.pdfIn PDF document text
    • http://bilabugova.iblogger.org/ets_toefl_practice_test.pdfIn PDF document text
    • http://wekanisa.scienceontheweb.net/factores_sociales_que_influyen_en_la_salud.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/nvjegfk/democracy_meaning_in_simple_english.pdfIn PDF document text
    • http://gasurorir.sportsontheweb.net/27184526192.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bobofawas.rf.gd/cnc_turning_machine_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39e3fb6-63b9-4c1a-908c-3ebf7c0c08f2/54438564654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b290b6e-5b8e-4f92-b424-f59edf0fa3ae/12236663551.pdfIn PDF document text
    • http://kokalukavevip.epizy.com/navipezozanawipopo.pdfIn PDF document text
    • http://toxifiv.myartsonline.com/foperesorosurufixov.pdfIn PDF document text
    • http://fezogax.rf.gd/teacher.depaul.edu_answer_key.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_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 5600 bytes
SHA-256: be511e35723952e4a9b59036c40036c957c84aba5ce0140bb055917b380589fd
font_01_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 11736 bytes
SHA-256: 52f0578b5522ae28a29c7d96db18b0cb583752cbf1e173f10ab69e129a279af6

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