Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bde3eeb17378968…

MALICIOUS

PDF

51.6 KB Created: 2020-10-08 08:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c4658b375afcb141008154030118a040 SHA-1: e3c87886903743e722fc605d6541bfcfc0321409 SHA-256: 1bde3eeb17378968804a5c9fef0429b7744b219b989bd41086dc7270c343e3cf
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/pify?keyword=formula+unit+of+molar+mass In PDF document text
    • http://files.rcnanorthbay.com/uploads/1/3/1/4/131438453/lexib-niwovexogis-korivu-funefemaxajuk.pdfIn PDF document text
    • http://files.contraltocorner.com/uploads/1/3/1/6/131637853/8307447.pdfIn PDF document text
    • http://files.suttonapril.com/uploads/1/3/0/7/130776159/2cfb2.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://cdn.shopify.com/s/files/1/0441/2653/5832/files/bsa_troop_committee_challenge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ebd895-efd5-4198-8b83-a229844cf2df/pozivukodesegepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e6f1a1-6277-4839-a6cc-0efe965d23a0/5534563822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dfa63a8-949e-49b0-b564-8651f520d3f2/pixiluwupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25bbe9e-0750-4ac2-a33b-d6e33e59ea4a/22154943943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81dd0828-3a6b-451e-be32-527ec39d3781/7065494819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c372112-8f7c-4660-9d6e-53d43767675c/nowosolizijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c05fdf-c8e1-4d80-9f6e-b0d3ce3da827/lolobagetizaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13f8ac0-8e5a-4809-85ce-c0efac9ef556/94449210149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92920645-2010-4a08-a37f-d699572ce4a1/pobuvit.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_off0000805d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805D 4632 bytes
SHA-256: 74ceb62406b0b7b6585dc04a2f0e82aea48c59a48c19022de9f5562fb4689abb
font_01_sfnt_off00008feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FEB 10496 bytes
SHA-256: 49163cf2c6eb4931844771a9f9d18fe1bde1df270f97f07298be322ccf5fd850
font_02_sfnt_off0000b3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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