Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5ba8eb5fcd1ab3…

MALICIOUS

PDF

68.0 KB Created: 2021-03-06 22:05:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3d4544aa5b3c8e7694a8c659997caaf3 SHA-1: fe4503847b409733c1cc3cc931ae01216766d76d SHA-256: 5a5ba8eb5fcd1ab3ba60908341a48c271aa5fd74ca5fbd9a73ac0b752a72e6d0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, with one particularly suspicious URL pointing to 'jacksth.ru'. The PDF's structure and the presence of many external links suggest it is part of a link farm designed to redirect users to malicious content, likely phishing or malware distribution sites.

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://jacksth.ru/123?utm_term=sears+craftsman+garage+door+opener+41a4315-7d+parts PDF link annotation
    • http://nizavevorupuj.mywebcommunity.org/ies_lighting_handbook_10th.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/zoom_g1x_four_manual.pdfIn PDF document text
    • http://afracheat9.xyz/black_and_decker_hedge_trimmer_replacement_partshvmto.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/guxape.pdfIn PDF document text
    • http://vosojivaru.mypressonline.com/how_to_fix_a_sunbeam_heated_blanket.pdfIn PDF document text
    • http://probmake12.xyz/tukaduziwuwiwobefoteprgqr.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/81651713514.pdfIn PDF document text
    • http://filemarker.store/52957266027juwtk.pdfIn PDF document text
    • http://myyshooop224.site/discounted_payback_period_example_problems76p13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_b38081d540fa48debe59b9d88ffd28aa.pdf?index=trueIn PDF document text
    • http://lirolisol.epizy.com/what_computer_programming_language_pays_the_most.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2192bd60-c8d6-4673-a2f8-4aea388fdf16/xibidupiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/670ad935-dab4-41f9-b839-ef1ce14f3d55/how_much_is_a_2012_honda_civic_ex_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de107e6a-4bd6-4035-97fb-aef462c4e866/83041758031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669452aa-3a77-4b91-b63a-5cfe8f7cc53b/88923907105.pdfIn PDF document text
    • http://bukinajomo.epizy.com/34695035791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2517de4-7e93-48ee-a53e-22b8a0e9e2bd/what_is_the_electron_geometry_for_h2o_molecule.pdfIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_556eea24aef0463381e4998188738e68.pdf?index=trueIn PDF document text
    • http://gobusef.rf.gd/zosupokamupudesazoxa.pdfIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_442702494aed4aadb80fbccae22b1554.pdf?index=trueIn PDF document text
    • http://wusopirixalanop.rf.gd/maytag_2000_series_dryer_start_switch.pdfIn PDF document text
    • http://zezewesiwakoruw.rf.gd/ford_6.7_transmission_cooler.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_off0000ca74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA74 6084 bytes
SHA-256: 87e79ebdfecf17aacf03d23b1b0d9947133e6190af25b8680efc468726deefa8
font_01_sfnt_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 10532 bytes
SHA-256: ba241d27d0925fde2f4f06a6338863177f9056df6990b4e6516a76e68848a8c1

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