Malicious PDF — malware analysis report

Static analysis result for SHA-256 805667f423969fc6…

MALICIOUS

PDF

46.5 KB Created: 2020-09-30 23:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ac3d8eb276115b066c1c87993f6d97a0 SHA-1: 35e1871af37e65b0aa042fa5bb94de8697a17bd1 SHA-256: 805667f423969fc6399ce922df2aeecbdadd4a2dd478cce42728fda19fc89f58
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://gettraff.ru/strik?keyword=human+blood+plasma+proteins+structure+and+function+pdf In PDF document text
    • https://site-1037135.mozfiles.com/files/1037135/demarubupomawilenatugu.pdfIn PDF document text
    • https://site-1036698.mozfiles.com/files/1036698/vetinesexanifowunu.pdfIn PDF document text
    • http://wijepe.thenourishedcoeliac.com/uploads/1/3/1/4/131405927/simozovotig-towibasaw-vapakis-kunavubifawano.pdfIn PDF document text
    • http://files.diggncuisine.com/uploads/1/3/1/3/131379700/9669579.pdfIn PDF document text
    • http://xafiki.tiffanyhdesign.com/uploads/1/3/0/9/130969813/079f67d74678b1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6f922a32-0583-4c61-9821-f83eb9fdd72c/kuzojipoxakusibexigos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b1a19dd-9251-4b12-9b7d-ebeea945b3be/finelavoseruvij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a883ca-4ae2-49f3-b821-e6485e0d0440/64060775629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/674a9120-48c5-4881-916d-a80237a5557e/39646125806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dddae65-f0bd-439c-a96d-07105d873469/42236361875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c77cbe-5771-4290-84d4-c80103d526de/2514218963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f497d96b-12ce-490a-8664-2d7cd75e7908/zowepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a67191-7204-44d0-9222-e74572f57d02/26595240322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e626d40-b658-4252-b272-344fa5d39cd8/tatopoganidivamino.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000693f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x693F 5284 bytes
SHA-256: fd77d0de9b1791f29bc96a0e602c14e65bc5a692171c52b2c47dced8b14c52d6
font_01_sfnt_off00007b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0B 10444 bytes
SHA-256: 3bb5b0fbdbacf4c0f576f5fe1de3c55c5ecdc0d52b0a51c03d500a4006c337fb
font_02_sfnt_off00009ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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