Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba37d0661181195…

MALICIOUS

PDF

76.0 KB Created: 2021-05-18 05:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0d2c34490accfe7f157e9caf5cb6d9e1 SHA-1: dd1d00810120605c255370c05db92c99ead55838 SHA-256: 4ba37d06611811958bf6a6e029f061ee96758d5dde225819fef26f3de0209b34
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=do+whirlpool+washers+have+filters PDF link annotation
    • https://feroraja.weebly.com/uploads/1/3/0/9/130969346/sareg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481270/normal_6036a328943fe.pdfIn PDF document text
    • https://taburexil.weebly.com/uploads/1/3/4/3/134374137/9948227.pdfIn PDF document text
    • https://pezolorizogor.weebly.com/uploads/1/3/4/6/134692003/mafufepivuki.pdfIn PDF document text
    • https://munulokepopat.weebly.com/uploads/1/3/5/2/135297381/e7e595f93.pdfIn PDF document text
    • https://zuwexonoporij.weebly.com/uploads/1/3/5/3/135317719/viroroxajuwabonu.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/9b16d4409.pdfIn PDF document text
    • https://tovunebutulewe.weebly.com/uploads/1/3/1/8/131871744/fbc1ff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_6033cad37ffba.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/45e5591c-49dc-45d6-bc3d-ea9b4282e4d6/how_to_fill_a_bobbin_in_a_singer_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b776908e-1eaa-4f7d-abf6-a25ea12d664e/best_outdoor_games_with_no_equipment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3963caa-e9dc-4cf3-9b32-d93bb41dbe77/final_fantasy_xiv_character_creation_simulator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc7df45-c66b-46a7-9a92-d1cc793f4b45/can_covid_19_cause_high_blood_pressure_to_spike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46376fca-8b1c-4731-8c3d-4941ab86fd1a/43340372959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57f15fd-b66e-44d7-b3e6-8efe0e1be2ee/did_odin_kill_lokis_father.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/875bb0de-c5ea-4f2c-8769-0a9a95db442e/xazegoropibabimul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12cc954c-de80-497d-a15d-d21de64abc3c/kayla_itsines_ab_workout_youtube.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_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 5140 bytes
SHA-256: dda43354d0c02118a1c9f7d360fb4b4558a58c0d0add980f076a4f21a8a074f3
font_01_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 10860 bytes
SHA-256: 6a61d1f6b617f5da8faf50d5306e372b8580cd303d2b188c533f82d849b209e9

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