Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b5dea96b76f61a…

MALICIOUS

PDF

33.6 KB Created: 2020-11-05 22:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: c7cceff8d7db9bf857bf96137d5f7aaa SHA-1: 34bac7ad360b17982970e4b55786c14c79427b16 SHA-256: a5b5dea96b76f61adcc3fd848ae7be10c847e3672e1544815efea41ea73d4746
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafficel.ru/aws?keyword=godfather+of+harlem+cast PDF link annotation
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/6910631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5f9073b865e34.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/bovajilamivakota.pdfIn PDF document text
    • https://sopudediliwaweg.weebly.com/uploads/1/3/4/5/134587721/a97e22421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5f9a64f5722d8.pdfIn PDF document text
    • https://wuwotozon.weebly.com/uploads/1/3/4/3/134315251/4971186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f9a299969a3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370284/normal_5f8dc95e0e327.pdfIn PDF document text
    • https://vezorobabuwej.weebly.com/uploads/1/3/0/9/130969079/xawiwew.pdfIn PDF document text
    • https://dugizade.weebly.com/uploads/1/3/4/4/134442098/dokotibi_nigavir_dajuvabudowe_fotorovu.pdfIn PDF document text
    • https://roxexiku.weebly.com/uploads/1/3/4/4/134445291/5011448.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/jadudusujuje/zujinarometo.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/degenerative_diseases_of_the_nervous_system.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/advanced_algebra_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/army_adp_6-_22.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/arduino_uno_working_principle.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_off00004501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4501 5292 bytes
SHA-256: d9a9ab349093351a35398382fe314ec5f6b8b36ded9e1e553fcbc9c9c609956c
font_01_sfnt_off000056d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56D7 10176 bytes
SHA-256: e36bde54782c3c01bc8c4e7182ebb0df0e970eb62acd71d899db8ace56a8dbc9