Malicious PDF — malware analysis report

Static analysis result for SHA-256 c320e5fe795e0770…

MALICIOUS

PDF

76.9 KB Created: 2021-06-09 02:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bada967e7b99218b21d431ce9d1b0ed9 SHA-1: bba9e752fc2e373d0a3cfb0100ced66d924a9d1e SHA-256: c320e5fe795e07708509e4662a04ea39afc969762e1fbf07a0f6f34adaba6492
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, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/pbw?utm_term=how+to+breed+an+epic+oaktopus+on+plant+island PDF link annotation
    • https://tazaliraku.weebly.com/uploads/1/3/4/8/134884946/rizerazaxelime-kudanonatifog-zapabid-biragigutipubo.pdfIn PDF document text
    • https://derewoju.weebly.com/uploads/1/3/4/3/134319287/1836287.pdfIn PDF document text
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/c57bca4a6.pdfIn PDF document text
    • https://vonekinorosasox.weebly.com/uploads/1/3/4/7/134732286/2638063.pdfIn PDF document text
    • https://tasunukalen.weebly.com/uploads/1/3/4/8/134888382/67d9aa.pdfIn PDF document text
    • https://juguxusomusivu.weebly.com/uploads/1/3/5/3/135327365/7997853.pdfIn PDF document text
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/182872.pdfIn PDF document text
    • https://xapawijumoj.weebly.com/uploads/1/3/1/3/131379373/0f37d752f9467.pdfIn PDF document text
    • https://vonazevuza.weebly.com/uploads/1/3/4/6/134603973/1b6f6.pdfIn PDF document text
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/japepod-vugigiwad-poxemit.pdfIn PDF document text
    • https://tanorejenajid.weebly.com/uploads/1/3/1/0/131071151/911852.pdfIn PDF document text
    • https://jitotapo.weebly.com/uploads/1/3/5/3/135314003/5390500.pdfIn PDF document text
    • https://putuxukive.weebly.com/uploads/1/3/1/3/131379249/delaxun-wopozor.pdfIn PDF document text
    • https://jepunitapo.weebly.com/uploads/1/3/1/0/131070437/rurejodevosozi-paludunipuvo.pdfIn PDF document text
    • https://sitadubudotewor.weebly.com/uploads/1/3/5/3/135335426/tuzifudijuduzi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favixose.pbworks.com/f/jolebebamijafemabe.pdfIn PDF document text
    • http://lulatigono.pbworks.com/f/14577960331.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/w/file/fetch/144438027/algebra_y_trigonometria_sullivan_novena_edicion_solucionario.pdfIn PDF document text
    • http://junerew.pbworks.com/f/papas_burgeria_free_download.pdfIn PDF document text
    • http://jebusolole.pbworks.com/f/wuzepid.pdfIn PDF document text
    • http://fokurid.pbworks.com/f/mitebobivotudakosunibusej.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_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 5324 bytes
SHA-256: bb5121474987754039667235da38ca1cc1a599f3bac4f8a3d2c211a4f22d9a5a
font_01_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 11580 bytes
SHA-256: 2753adec66ee1d3cd77783d632be2e60aa6f6ee0f6d20fdca9e8a1e60068b22d