Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a4d44610ed9f18…

MALICIOUS

PDF

42.6 KB Created: 2020-10-03 17:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7f93e41f070ec396ace61d443ef13907 SHA-1: 8055ef24686c3d8e40eec3256cea592133177d95 SHA-256: 37a4d44610ed9f186fafbbba81de9de946e942479eda2a3c82710ebb4cbe1017
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://cctraff.ru/strik?keyword=escalas+de+medicion+del+dolor+pdf In PDF document text
    • http://muzoxafo.kjamstudios.com/uploads/1/3/1/6/131637016/ledimafekozetaj.pdfIn PDF document text
    • http://gaxawege.swanketyswank.com/uploads/1/3/0/7/130739779/3252304.pdfIn PDF document text
    • http://files.miamiepoxy.com/uploads/1/3/0/8/130814226/pitaderilasavuwipu.pdfIn PDF document text
    • http://gegap.yakdoc.com/uploads/1/3/0/9/130969465/7ae5df194.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/8fb0e944-7776-414c-b08b-f645a558c9b9/juwasuvejulesujoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457f1d8f-5768-42b4-a735-310455f431d5/77100292010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1f21cc9-ac8c-45d3-b75e-c1c9b0ac107f/gigujezupedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac43798-c2c1-4973-afeb-c89200bd143a/gimipulotin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/508fe900-5dd3-4a97-bbfe-4c68084089f6/lovuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d10f3cf-25bc-4b5e-b984-befea4ee7466/dofojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e87009f-153d-4822-b1f1-f1e7eeb516dd/58156954613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6304914d-6689-451a-b8c8-fb9bcb210825/loxogivegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a7e5dae-7a9b-40d2-8546-417355127655/52097085339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691db48e-ac41-42a1-834a-d777b33e2819/14156737781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1c68a8-ca37-4c05-9a20-a3578d11ca42/53583790935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af78b2ed-fa7f-4534-8e49-9ce77438cdb5/sulugip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78dee380-0077-48f9-81b1-a59d232453fd/buzeluwekod.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_off00006644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6644 5256 bytes
SHA-256: 255895982d35fae2b0c916545f493963bc71b0c94d22cd2f7fd8ad6b719d8a9d
font_01_sfnt_off0000780f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x780F 10960 bytes
SHA-256: 77294b8154938b1523514ce99b4b3bd401575c6b5f407de6a07513ba5f495ff4

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