Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b79ec5222ac27e…

MALICIOUS

PDF

44.0 KB Created: 2020-11-09 16:02:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 5ee2f1f3f9e12a977f288052f13aa639 SHA-1: aab5796422f6f3edc6bcc44660a0ef8afba72cb3 SHA-256: a0b79ec5222ac27ee5d058a64d4591cb1ce733bfee3d2f8d8060642b8a62398b
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://trafffi.ru/aws?keyword=clc+command+in+matlab PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5f951956bb3f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_5f8bf73b7d492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393369/normal_5fa698d201384.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/nagabitido.pdfIn PDF document text
    • https://kenumobubedu.weebly.com/uploads/1/3/4/3/134370592/1275775.pdfIn PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/4799565.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/gupawupigawono/niosh_pocket_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/gedimelaxatev.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/ninilolewivusudixigikoluv.pdfIn PDF document text
    • https://s3.amazonaws.com/mejediparaxi/latin_america_customs_and_traditions.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/polunobivorabaxevegukosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f017816-2cfd-41cf-b27d-fe9706749b16/gojomukoperasot.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_off00006a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A08 4856 bytes
SHA-256: 8b0f061fc4feafe848ce8aa0273d8f1bbfbbe56a21158c6e6a3eafab071fb436
font_01_sfnt_off00007a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6E 11908 bytes
SHA-256: 92217fca0f5d6df2323c64680af3d612ea41e75d8fce1a8b6263487e697a4e8d