Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbc69e0e59717f5…

MALICIOUS

PDF

80.6 KB Created: 2021-06-02 08:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1b8adb73f5e2515f09e9eac720449858 SHA-1: 53c735b9c911227bb59e404b46e33e230fc312a8 SHA-256: 3bbc69e0e59717f5020ff63104140694e44f0dedf4f2c455f935ed65245986cd
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://allytemp.ru/pbw?utm_term=descargar+licencia+segurm%25C3%25A1tica+antivirus+gratis', suggests a lure for free antivirus software, which is a common phishing tactic. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

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://allytemp.ru/pbw?utm_term=descargar+licencia+segurm%25C3%25A1tica+antivirus+gratis PDF link annotation
    • https://tedatigajixa.weebly.com/uploads/1/3/0/7/130739480/rojemiruro_tafibesatitaju_pesem.pdfIn PDF document text
    • https://birijoxumel.weebly.com/uploads/1/3/4/5/134587798/werumumam_posukeletewofe_kikotubilafe.pdfIn PDF document text
    • https://fosakozetabu.weebly.com/uploads/1/3/1/4/131483491/dotutudika-xipobuxege-lulerovanin-dodumi.pdfIn PDF document text
    • https://vifawadezak.weebly.com/uploads/1/3/4/8/134846548/891570.pdfIn PDF document text
    • https://nelunozulugekis.weebly.com/uploads/1/3/0/7/130739970/443f879.pdfIn PDF document text
    • https://guxatizozekeme.weebly.com/uploads/1/3/4/7/134733227/86aabad1.pdfIn PDF document text
    • https://nenikekawudiw.weebly.com/uploads/1/3/4/4/134468161/cfcc09b4a.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/6ad198ea-75bc-4434-8f4a-ffc84ca92a15/46655047987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4138386e-38bf-43db-8804-cd06aafc0050/17324435257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd82fe3d-3624-4aad-853e-7dfa1804d01d/whats_the_diff_between_virus_and_bacteria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3162f9bf-2c24-4679-a3ef-4f7acb1f0072/balimigebexod.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/89852375462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c7ba56-a482-474e-a40e-60a308fcfd45/brother_hl-5250dn_drum_light_flashing.pdfIn PDF document text
    • http://jijagenaneke.pbworks.com/f/planeacion_ciencias_1_biologa_secundaria_2019.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/gevefawugijedivusasub.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/84128806592.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/21072436905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3530ce42-c384-4a45-be83-d4c5d2870149/what_types_of_coaxial_cables_are_used_for_d-607_applications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee2fc65-9d37-4f42-8f8d-553f7b8103fb/nodarulapefalukidixaten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b565db48-2f58-49cb-bfcd-06bfe8aa92cf/43207775383.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_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 5412 bytes
SHA-256: ae095556ee422336951e4fae78bf70da11730042afd3d101a14a1fe7db591a2d
font_01_sfnt_off00010b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 12072 bytes
SHA-256: 79f2c3bf03657bf46674012acf763eb8edb87cf8b2ea45c22eea951b3bef5c52