Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1df73eaa3adc88…

MALICIOUS

PDF

44.9 KB Created: 2020-11-06 11:33:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 7e0a7de34cf3a0585c599ae2832a60b2 SHA-1: 8d4423ef28116e6b37c94c14b160aa8fb25f3878 SHA-256: 8b1df73eaa3adc88f246a315fae48879790c11c5e6f5943befefc6a566bd5820
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://traffset.ru/123?keyword=owners+manual+for+murray+riding+lawn+mower PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416513/normal_5f9bee1ac6102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_5f8fa17a7597b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f8da8e2a9596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383561/normal_5fa35a62de986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_5f9e4cd835fe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_5fa00aae090ba.pdfIn PDF document text
    • https://nagopajasire.weebly.com/uploads/1/3/4/3/134311949/6809068.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a066e65-36a7-4a50-ab09-3ecddd93ae07/cub_pilot_on_the_mississippi.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/polk_audio_monitor_70.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9504/1211/files/va_grades_umd.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_off00007052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7052 5448 bytes
SHA-256: 735761e00c0185620d2b087383927d661502fa23ac526bb3da350cfeb7dc5e7c
font_01_sfnt_off000082d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D9 10536 bytes
SHA-256: 906db529467fce9f3f4e6524e26f387a8dfbafe760bed8ab9fbb30bf1728daff