Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b28d29e9da0e4d…

MALICIOUS

PDF

76.6 KB Created: 2021-03-20 09:33:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 48ab7183a128f089f5aeac964a8b679c SHA-1: 2656a4138ecc3f3f954d6e5dbb8a0a3d316d3f4a SHA-256: 33b28d29e9da0e4d553058ba2ee64b7243abb17a8b16723a59a462da553f2d26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicative of a link farm or SEO poisoning attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cdn.sqhk.co/jojojidatun/CigDjgW/begakuliwusa.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_6049801f0cc83.pdfIn PDF document text
    • http://nafigunagofadab.getenjoyment.net/why_isnt_my_electric_furnace_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_60503a45db287.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476270/normal_5ff33c673e73c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370284/normal_601155fb5a34a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455876/normal_6044f829f156d.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/jfdhjb9/new_york_city_map_and_walk_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490127/normal_5fe4d275a6cdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5fd09c75eced5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477162/normal_604e8e3146ce9.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/hlsT2vP/carlcare_service_luthuli_nairobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463275/normal_604340de8e395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dRGGkpkNhSI/wb?keyword=bowflex%20power%20pro%20leg%20attachmentPDF link annotation
    • http://satawakerexe.atwebpages.com/element_40_inch_roku_tv_review.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/what_are_some_good_time_management_strategies.pdfIn PDF document text
    • http://pekamidakoj.atwebpages.com/lord_of_the_rings_tamil_dubbed_movie_download_in_isaimini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52a15625-4627-42a0-aef0-714d037cc6e0/tarzan_the_ape_man_1981_full_movie_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9d366e-14f9-4fb1-9692-39864f9fe6fb/can_frozen_lemonade_concentrate.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/58334281386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58df957-1018-4a24-a213-f3f5127aecb7/murad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df58a16-2cff-45b7-806b-b3519e308301/foruvenemilidetivuzizabiv.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/bikoruziboxevalepatesag.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/wuvodajebapapufar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a42e80-5007-4af4-bd4d-dc1af8e9792c/krups_rice_cooker.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_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 5460 bytes
SHA-256: 1a073898b99e05ef84e124d5ea1cf7221bdc266beb3e450608ee2f1da7620624
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 10912 bytes
SHA-256: 25931518583b033900e63a024786bf49050db36dedce6cbca4780f60a1477f47