Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd640f34142bdda…

MALICIOUS

PDF

82.3 KB Created: 2021-05-21 09:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 59cb8881db1ee72a9f692ab601d425d7 SHA-1: 22c77217cf19e05da5b67832d374e500a0de1899 SHA-256: bbd640f34142bdda5b82c3388b298426b214392e15171988f7fc6dd6d61d3698
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/strik?utm_term=commandos+behind+enemy+lines+2+android+gameplay PDF link annotation
    • https://nulupuro.weebly.com/uploads/1/3/4/5/134596779/jobopufevikuvufetar.pdfIn PDF document text
    • https://tupipano.weebly.com/uploads/1/3/4/5/134598946/rigimenative.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472216/normal_601e28bd1593f.pdfIn PDF document text
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/1530591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_605f844c0167e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483359/normal_60188702891c6.pdfIn PDF document text
    • https://subegudikowezi.weebly.com/uploads/1/3/4/4/134476363/sunokot-difowipixesu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385413/normal_5feedd1a9522d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_605df2b70e393.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502920/normal_60063ce87448a.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/007aeb72-c802-4b94-b69d-d6bb86faffae/exercises_to_increase_your_vertical_jump_volleyball.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/variable_expressions_worksheet_2.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/31815600473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c1dd76a-62c8-4013-86ee-fe444aca0cff/70725287025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a884f8aa-65df-4a23-8782-a0e62daf4dc8/resetear_toner_brother_mfc-l2710dw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/583ad342-4d2e-4c70-883d-fb4cf799e402/pipamozefusatozoxomope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e8c5e0-3e18-48f5-9adb-4c30b7ae517a/taposukiwebenuzefaloler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6763e325-e259-4077-a8ab-ae891df05ccb/viguzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/285d798e-fec9-4ee7-baa4-ba20135681a5/what_is_the_highest_safety_rated_small_suv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85104893-5949-4239-b257-e5459e3a0581/does_ikea_do_king_beds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a365c726-88db-4588-93a9-3985252e4f78/karabewavevovu.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/2006_chevrolet_malibu_ls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e59f83c-ee6f-4de3-b88b-01cf64f4c81e/how_to_determine_velocity_from_position_vs._time_graph.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_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 5652 bytes
SHA-256: 207d6b491c2ba6755c6b892e673ac11f8224e2bee3c4a520e9f523e20ac6b5d3
font_01_sfnt_off0001133b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 12324 bytes
SHA-256: 3e07bcf02ec7bab1e6f3598409aca2ffd7ad7bc22e2c8ec5a84bcb251c0ec3b8