Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0ab96ff83a6442…

MALICIOUS

PDF

87.8 KB Created: 2021-02-27 06:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9fa6e65777c848f7e5d4ee2f15ce5969 SHA-1: 6cdad8ed7542135e3df872d41a3e0a3e9640381c SHA-256: da0ab96ff83a6442611126da1b6741a8b9c93e5749c2f9942d26083389a1ac26
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many hosted on disposable domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a link farm structure, suggesting the document's primary purpose is to redirect users to other sites. The presence of an embedded URI and the overall structure point towards a phishing or SEO manipulation scheme.

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://crophysi.ru/wix?keyword=dr+donald+r+davis PDF link annotation
    • https://zufulakoloti.weebly.com/uploads/1/3/5/3/135301661/musuvo.pdfIn PDF document text
    • http://pesale.pro/jitewijuwowowowisifibe13kfz.pdfIn PDF document text
    • http://djami.ru/bacillus_licheniformis_atcc_14580m7gj2.pdfIn PDF document text
    • https://xaxusadusu.weebly.com/uploads/1/3/4/4/134497069/5077330.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/baputizosix.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/341564.pdfIn PDF document text
    • https://dugubutufafug.weebly.com/uploads/1/3/0/7/130775350/muzinovezomeso.pdfIn PDF document text
    • https://kunaxujo.weebly.com/uploads/1/3/1/4/131406864/f67f30477117.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/heart_of_darkness_online.pdfIn PDF document text
    • https://zerasogamonan.weebly.com/uploads/1/3/0/7/130775055/sader_mobifepabeburab_vojepazidimesex.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/6157defb.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/how_to_use_ge_gas_self_cleaning_oven.pdfIn PDF document text
    • https://koxiguxizabi.weebly.com/uploads/1/3/1/1/131163763/984c45b2e2093.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bodajaku/sikevelu.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/kad_emule_lista_aggiornata.pdfIn PDF document text
    • http://zilowovuv.atwebpages.com/solerotixesopakuroju.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/jesukewoso.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/esperanza_rising_book_reading_level.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/fidajirikemenixelizulu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 4880 bytes
SHA-256: a63c3117bf59c140dd2d02bb73c53d33ce2b821687ae2023368c6d1ed099cc75
font_01_sfnt_off00012d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D72 11176 bytes
SHA-256: 9582292b7f502f199af529b3ebd7d32c5c737e4778a7a9db40db2555a3721de6

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