Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e72e5d99a45b5c…

MALICIOUS

PDF

74.5 KB Created: 2021-03-12 17:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b654c01fa97024f936b108236b57541e SHA-1: 5a942a484537ef5e19ccc1c52f7dd494edfeae34 SHA-256: 44e72e5d99a45b5ce7b6fd9528e2288edb3038416a89e95019e85785e9bf577d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://dafemum.ru/123?utm_term=cessna+310q+poh+pdf PDF link annotation
    • https://runufegoxow.weebly.com/uploads/1/3/5/3/135347372/1551658.pdfIn PDF document text
    • http://makedctl.site/31056873534wbavn.pdfIn PDF document text
    • https://rereviraret.weebly.com/uploads/1/3/4/5/134512362/7e34895ea2bbcdc.pdfIn PDF document text
    • https://zejosawazir.weebly.com/uploads/1/3/1/8/131856185/9618331.pdfIn PDF document text
    • http://fruitslope.online/sovekikisasiwanigisv9nhw.pdfIn PDF document text
    • https://vaxidavuk.weebly.com/uploads/1/3/4/3/134371973/famegexu-wuwadotajavibur-fosatizewotek-vopewaritawabo.pdfIn PDF document text
    • http://apsdd54gfv.xyz/lumion_6_pro_download0tne2.pdfIn PDF document text
    • https://dewixazupeteti.weebly.com/uploads/1/3/1/4/131455636/e1a3b8ef787a66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a72c692e-ae51-4e70-9e6c-28ec80f93f92/health_o_meter_lose_it_bluetooth_glass_body_fat_scale_for_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f2bad80-7c0f-404e-ac4a-ce7496ed570a/8553923173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a4938a-fc2f-4efc-be12-0f5f2bc3154a/how_to_release_piriformis_syndrome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5adaae3-7fbb-4fe9-9d4f-b95d3350de1d/84527982790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d2733a-bd42-4894-b61c-1d61274b00c6/how_do_you_cook_brown_jasmine_rice_in_a_rice_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e95b41d-7a1d-49be-a3ea-90117b460440/what_causes_blister_like_bumps_on_feet.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_9509352b76794dea88cf6c418911ddb3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7471ea0-9fb6-429f-a814-596cf4e79b3c/ximefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25df628-d6cd-4fdc-91ec-2c7b5f459ed6/bmw_e30_repair_manual.pdfIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_df55de13eec8459684a8fa7646417f56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de51c39b-d8dd-49af-a0e3-01495481dd20/how_long_does_it_take_to_become_an_emergency_room_physician.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4cfa85-2693-4f1f-9d2c-874ac85253fc/lidezex.pdfIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_06f17f67035e484aa27f1a2764fbf4d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abaee51c-8283-421e-b3b7-bb6b17315077/the_time_travelers_wife_author.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_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 5388 bytes
SHA-256: c98d193baa5bb3c8b86a439908bf88c6e2255cdd1602abbce2e4ff6929f545bc
font_01_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 11552 bytes
SHA-256: b7e4bfa4521a9292972117cdd40448a53349d2cea129c3d830f7c63ad43ca310