Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54066ef3657eef5…

MALICIOUS

PDF

71.7 KB Created: 2021-03-22 14:58:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 70af9e1ccb661ae0ae9fe93dc85c4840 SHA-1: 9e8cef73b5c0a2d7a76c5bec04d4f94e51922cd6 SHA-256: b54066ef3657eef5024f468e4ddeceaca4c6820b1d3f088eaeee16f4aa591ad1
126 Risk Score

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 heuristics as a link farm and by ML classifiers as malicious. The document body, though heavily obfuscated, contains text related to accessing a DVR, suggesting a lure to a phishing or malware distribution site. The presence of multiple external URIs and the overall structure strongly indicate a malicious intent to redirect users to potentially harmful content.

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://seumenha.ru/aws?utm_term=how+to+access+swann+dvr+from+computer PDF link annotation
    • http://usesol.xyz/988997935192c54c.pdfIn PDF document text
    • http://sollabs.xyz/xegiluzenesaroguwumewumugkzd65.pdfIn PDF document text
    • http://nextauto02.ru/what_is_the_neo_personality_inventory_used_fora5iei.pdfIn PDF document text
    • http://numupizor.22web.org/perimeter_of_polygons_worksheet.pdfIn PDF document text
    • http://mofonuf.medianewsonline.com/ceptam_09_syllabus.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/public_policy_formulation_process.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/card_management_system_in_banking.pdfIn PDF document text
    • http://simekavo.22web.org/what_is_it_called_when_the_sun_goes_down_early.pdfIn PDF document text
    • http://temevifeg.iblogger.org/kosume.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
    • https://uploads.strikinglycdn.com/files/bbe97aef-0d97-47d7-bdf0-712c4e27adec/64825799330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/121b0283-9b10-4e82-9d8b-887f0f44dbb9/leruzutasuditiman.pdfIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_b200940dae20465aa2932fea83a7ef84.pdf?index=trueIn PDF document text
    • http://fobupozomorefiw.epizy.com/80459832265.pdfIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_33e9dee1670e4c35aa9b2fb88e91a4b3.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_65f20b544c5f4e7682ab9a69347434a8.pdf?index=trueIn PDF document text
    • http://rofuvawitarul.atwebpages.com/67379048769.pdfIn PDF document text
    • http://tebuwawezizafes.onlinewebshop.net/character_reference_letter_court.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea944183-4164-4aa8-b220-87946f0c6f7f/garmin_vivofit_jr_2_factory_reset.pdfIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_873a2a3ab42e480e992908bc7a05524b.pdf?index=trueIn 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_off0000cf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7C 5216 bytes
SHA-256: 8af239925a09f35b2e36f7c430300de4fbcb8632d0982ee5b7540e67b2d8e94f
font_01_sfnt_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 9940 bytes
SHA-256: 2c1a36182d8d3cdfdfef1039f86fcc62a0396b9fec48a24e3ddb28a637d4567e
font_02_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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