Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce045f09f70088f…

MALICIOUS

PDF

75.0 KB Created: 2021-02-08 05:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8487e7f666ca7a01035e8ade144f01b1 SHA-1: efe32756845212f8712530a93623385451d41bd2 SHA-256: dce045f09f70088f0680a32a293057e0454f6448d077c71c2a1d3632ac276f03
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to 'comparing words worksheet'. No scripts were extracted, but the presence of multiple external links strongly suggests the document is designed to redirect users to malicious sites.

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://bologen.ru/aws?utm_term=comparing+words+worksheet PDF link annotation
    • http://kokofiru.22web.org/basque_country_tourism_information.pdfIn PDF document text
    • https://tonewebebajuja.weebly.com/uploads/1/3/5/3/135319275/032aa91fa.pdfIn PDF document text
    • https://kenojitoxudu.weebly.com/uploads/1/3/1/3/131383977/fotejiwopi.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/P1zYZig/47804623794.pdfIn PDF document text
    • https://cdn.sqhk.co/tolebilu/jgfJghd/can_among_us_play_on_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/MMJhgkk/summer_mountaineering_gear_list.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/sewaniv-jutafesusezi.pdfIn PDF document text
    • https://mafewesoxadix.weebly.com/uploads/1/3/4/6/134697647/lalemepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_601150d232396.pdfIn PDF document text
    • http://gunaborekigefu.22web.org/careem_car_booking_app_free.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/fawobililopuja_loviwuruke.pdfIn PDF document text
    • http://pusaburuku.22web.org/miwelozezuwevozokepumu.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/vieNUhe/anger_of_stick_4_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tatenawagoxibe.epizy.com/demimazirolakafikenadapat.pdfIn PDF document text
    • http://lafumiseweno.epizy.com/29106801224.pdfIn PDF document text
    • http://zavujosabojid.rf.gd/amorphous_materials.pdfIn PDF document text
    • http://lekugonaj.rf.gd/52413824989.pdfIn PDF document text
    • http://zalezir.epizy.com/rofivetonuto.pdfIn PDF document text
    • http://lanakupi.epizy.com/gopuwoguxeronokamoxowo.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_off0000e7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 5400 bytes
SHA-256: f557f7e5284f93e7ea4e6f8b1690fed5cda6bd35d21ead7e9e83f21f8804e4da
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 10624 bytes
SHA-256: 314c4658091609bd93b0f6f105c98a458654b3e48047501741714c5906064ab5

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