Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fdca437ba6a047…

MALICIOUS

PDF

47.6 KB Created: 2020-11-07 00:59:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: f12b6fc0ed9be455b5a724f3d15aac50 SHA-1: 62e4e10678ff6f41f9429a5611667fdbe0d4e137 SHA-256: 78fdca437ba6a047cce993e64d61f7ecebe682535f04c31bfeb5f953c2f0340b
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/123?keyword=kenmore+coldspot+52552100+manual+pdf PDF link annotation
    • https://linezeludamaxen.weebly.com/uploads/1/3/4/3/134340908/123387326e3.pdfIn PDF document text
    • https://xasugalepo.weebly.com/uploads/1/3/4/3/134311154/vudezat-fidupodevu-movedowoxije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_5fa293f806857.pdfIn PDF document text
    • https://pasutexovemas.weebly.com/uploads/1/3/0/9/130969198/gapol.pdfIn PDF document text
    • https://jorimedazaget.weebly.com/uploads/1/3/0/7/130738946/wasexega.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/3ee4baf2-0a33-4c87-98a6-a14c96306361/32244067914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e232a7-b91f-4eff-be3b-56af4c3f1ad8/burrito_bison_game_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee6aff28-030f-4865-8957-b99e01ec28f0/18097015209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/052d9568-d72a-4473-928f-2e9bf36ac3ec/54799819659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd48dd4c-659b-4e99-b703-48945d805b36/kaduvibujupunipano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d6b595-e5d3-4bef-9818-a995d3805ceb/ziwulojasosivanadeve.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_off00007c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C23 5720 bytes
SHA-256: b45de2a00504364a32da38eeb82c8dfd1953c05431577359f0bda779fa1960d2
font_01_sfnt_off00008f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F97 10076 bytes
SHA-256: 3c9d8f5bc4b41ad9c01c8b8177153b11047b1a8808426d1853282ff7fe8e69dd