Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84a9b191da21067…

MALICIOUS

PDF

104.9 KB Created: 2021-03-09 07:24:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8934cabea817490c174039a0c27cdb0e SHA-1: 8dbba2a8f46effe015d0108786d75e547b806f03 SHA-256: f84a9b191da21067a322196959965ee90f07b33852ec4b2c06636b1432742031
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a likely SEO manipulation or content distribution scheme. The ML classifier strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://xezojetit.ru/wix?keyword=global+regents+study+guide+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5fd12dd75235a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5fd79241e2442.pdfIn PDF document text
    • http://potenciy.xyz/leica_m6_ttl_0.58ojuqc.pdfIn PDF document text
    • https://xozejijijov.weebly.com/uploads/1/3/4/3/134315997/5657568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_5fd204ffb4326.pdfIn PDF document text
    • http://helpforteam.com/96880083464jfz3z.pdfIn PDF document text
    • http://itabody.space/vaxutadatibuzi1p50x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448985/normal_5ff628a0e0287.pdfIn PDF document text
    • https://digakope.weebly.com/uploads/1/3/5/9/135974251/bopademiwoxov.pdfIn PDF document text
    • http://aov.one/mcculloch_timber_bear_chainsaw_partsfojah.pdfIn PDF document text
    • https://podetixado.weebly.com/uploads/1/3/0/7/130739559/e29b988092.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421768/normal_5fcf2371ba412.pdfIn PDF document text
    • http://qqkaxes.xyz/38164967811nejrc.pdfIn PDF document text
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/divatikulonex.pdfIn PDF document text
    • https://rifewageza.weebly.com/uploads/1/3/5/3/135349229/3597392.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/dufekifaral/koroxetodixuzojin.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/1_through_1000_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/ww1_nurse_uniform_costume.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_off00015876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15876 5748 bytes
SHA-256: cfcfb6e01cd081aba04a7cd99b6d5fb821ab230815450363ec433508fcbc3e2e
font_01_sfnt_off00016c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C13 12720 bytes
SHA-256: dbabef0025837a2be854027b417556da38e5424706243dc1b58d4aafbce80703

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