Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbca28f5c01745ec…

MALICIOUS

PDF

40.3 KB Created: 2020-11-08 16:00:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 715b21655952d50ca5c8f4677ae77ae3 SHA-1: f96d69f64f013d236e7e7336badc8ceb08dcc591 SHA-256: cbca28f5c01745ec7d02d61b1ba049efac51ac6c10f0aa23bb13d5b061072f92
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?keyword=the+period+repair+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370284/normal_5f88a9e50787e.pdfIn PDF document text
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/vepavef-fubuxexid-zisikanifon-zifupipup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_5fa0034c3a972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_5fa19a246a5f1.pdfIn PDF document text
    • https://difiraboveju.weebly.com/uploads/1/3/4/5/134508976/funugilejibika.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/xenavuxa/two_brothers_tolstoy.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/wopawudan.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/wikodizopolilisa.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/learning_theory_psychology_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/24834845910.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/41592813847.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/the_synchronicity_key_david_wilcock.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/nuloperapezudurudi.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/rehearsal_dinner_etiquette_toasts.pdfIn PDF document text
    • https://s3.amazonaws.com/tosasugokod/61137636848.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_off0000611a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x611A 5052 bytes
SHA-256: 85c108c3b3d6ba3a82d85b7cfe38699b014889882124ef3569fa93b44f1f852b
font_01_sfnt_off0000721e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x721E 10064 bytes
SHA-256: eede036cfe9ee4ae6dbfe08b9dcc494750d4550b1239c8c1c433e69e082688a7