Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dcc2ea78b928f7…

MALICIOUS

PDF

70.4 KB Created: 2021-03-14 23:33:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3f6557fe49ec6b8de108b784fd80222d SHA-1: b40ec29b9860a626cb8b873feb4bd2d58197c661 SHA-256: d8dcc2ea78b928f7aa50d220cb654f0b39efeecce5e893493963e23b04e8f226
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, indicative of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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://jumiwimov.ru/award?keyword=allopathic+medicine+book+pdf PDF link annotation
    • http://tuvolabuzibode.iblogger.org/vixotenitexi.pdfIn PDF document text
    • http://xigotazuwal.iblogger.org/lavixasa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_6018e254eb731.pdfIn PDF document text
    • http://nuxemuxexajimo.22web.org/brady_labelmark_5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_600ebc9ceb007.pdfIn PDF document text
    • http://wuvevaj.iblogger.org/26465089733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470837/normal_60275becd1881.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424666/normal_6003e4cfde428.pdfIn PDF document text
    • http://bibajif.22web.org/classroom_rules_and_consequences.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469630/normal_5fd92e9727d21.pdfIn PDF document text
    • http://xanuxitawunavi.iblogger.org/gawetuxetim.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/what_anime_is_one_punch_man_from.pdfIn PDF document text
    • http://valigulepi.scienceontheweb.net/41320857324.pdfIn PDF document text
    • http://ladunosim.sportsontheweb.net/navy_seals_training_base_san_diego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kojenixerog.myartsonline.com/do_you_still_get_paid_for_leave_of_absence.pdfIn PDF document text
    • http://libigik.rf.gd/how_to_turn_on_american_messaging_pager.pdfIn PDF document text
    • http://latilofu.rf.gd/delay_and_sum_beamforming_using_matlab.pdfIn PDF document text
    • http://xazopufegi.onlinewebshop.net/26229798388.pdfIn PDF document text
    • http://sanikivatuma.rf.gd/jamilisolusimujopasa.pdfIn PDF document text
    • http://lepamiruketujuf.epizy.com/suxeb.pdfIn PDF document text
    • http://koxogulu.rf.gd/calibre_2018_parents_guide.pdfIn PDF document text
    • http://tuvugagud.epizy.com/gewowidatilazixavup.pdfIn PDF document text
    • http://pelewonaxiguso.epizy.com/fybsc_physics_practical_book.pdfIn PDF document text
    • http://wirokafimuda.epizy.com/advanced_excel_essentials_free.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_off0000d28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28F 5316 bytes
SHA-256: b66e8e8ed4f08bacbb5c9c4bcdb43631830954bd612e0e53d731ab0a3727824c
font_01_sfnt_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 11404 bytes
SHA-256: f6f8c813a0571cc1323c6fdbbd9708ba7feb2c6d8fbf5e13c44b89d5418a8fb7

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