Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f365d4ba8be3c4…

MALICIOUS

PDF

82.8 KB Created: 2021-05-09 17:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 758b78542d8b85862c3215d0d851eb60 SHA-1: 5e1b203859eef3d9374acdacc79d34a9079b7821 SHA-256: e5f365d4ba8be3c46a31fb82cda529ac3ae383514ad10b28d40f25ceee5555f8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The primary malicious URL identified is https://jumiwimov.ru/strik, which likely serves as a distribution point for further malicious content or phishing attempts. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=nasb+thinline+bible+compact+leathersoft+brown+red+letter+edition PDF link annotation
    • http://xejepurefe.scienceontheweb.net/anexos_oaci.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/7EXjkbN/accounting_bookkeeping_invoice_expense_inventory.pdfIn PDF document text
    • http://vibijinit.scienceontheweb.net/forced_marriage_urdu_romantic_novels.pdfIn PDF document text
    • https://cdn.sqhk.co/lamijaluxeso/hcicig5/mcdonalds_breakfast_hours_melton_mowbray.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pekafujojef.onlinewebshop.net/cortes_de_verduras_y_hortalizas.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/how_to_use_reverse_psychology_on_a_man.pdfIn PDF document text
    • http://lozefedewi.rf.gd/alibaba_apk_mirror.pdfIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_62c6e1b0d614495683dc27d1ea288254.pdf?index=trueIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_439f93516be94fb49a22040435e36aae.pdf?index=trueIn PDF document text
    • http://duvodix.myartsonline.com/bijemutugizedinomer.pdfIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_10726c79b76241118794c80619104be4.pdf?index=trueIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_a37f4424ea2d48fdaea69753da8a6a44.pdf?index=trueIn PDF document text
    • http://naluvexuwemajub.rf.gd/81842520981.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_cae2455ba91c4f7bb486ff4347444db7.pdf?index=trueIn PDF document text
    • http://zawuzujuw.epizy.com/pasteurization_equipment.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/what_exercise_is_best_for_core_strength.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/cateye_padrone_digital_wireless_cycling_computer_speed_and_cadence.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_b083b88d21d6477f8cda5277f97218cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidenigad/bigit.pdfIn PDF document text
    • https://c5c1e25b-3ca9-4f8f-aecb-0ee3b29cb37b.filesusr.com/ugd/f4fe7b_2f3f11b7303b4e8e9cbbc4eef60ef32e.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_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 9724 bytes
SHA-256: 49ae7158e2b67b2f338e30a780e920121a6271d05017b7bb38cbe91b7db876b4
font_01_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 5596 bytes
SHA-256: 57747fc66f9d22887d9a7fc8592ba287f1220be1e6a587554af14a3588efcbf1
font_02_sfnt_off000115f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 10776 bytes
SHA-256: fbddf71487058a4760ea17af15f20b13f70e88f76037be2b217ddb668549dec0