Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76cf1621bad74bc…

MALICIOUS

PDF

40.0 KB Created: 2020-10-01 10:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 7b382cda19f1058201d883d74f0b0523 SHA-1: fb62cda8ebfd30b101449a518f40c4c505a29162 SHA-256: e76cf1621bad74bc91ea52436ac3ad93111885f962b0982483f9ce1305317a3b
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://ggtraff.ru/strik?keyword=copy+reading+exercises+with+answers+pdf+english In PDF document text
    • http://lopanisu.dahliaspourhouse.com/uploads/1/3/1/0/131070420/zupiwog_nujapejevopuni_viduj.pdfIn PDF document text
    • http://zafikutet.llrecognition.com/uploads/1/3/1/8/131857112/5849077.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/86a016fb-4a5c-452b-9264-e58b2e6a0988/76806242097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a731a934-de93-4188-9110-64f2da88b6c4/35182080769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd379a10-f26c-48e9-8a8d-9872c2e355fb/28806850669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9797e2-f65a-431f-b85f-fe33180fa4b9/tikafutinamupesewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7f7510-4109-4873-a4c0-718a6233490e/zulinamixipimorimakik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f155f94-80d0-492a-8fe6-c92f209d428e/75885613149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c152d325-97d4-485c-93ad-5e5fb33ff114/musonuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4597bcc7-41c1-4005-a6aa-fcd65ad8cfd8/44793800858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bdd9ccb-00b2-4ed3-80f5-6238aad23836/59508013179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb596a00-ec6f-4d90-bda3-ee7240552d64/kuvulusano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6953b736-9d64-414a-97f0-2a925538017f/pirikamevifovanabot.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_off00005cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDB 5584 bytes
SHA-256: b80424eb6642db1843867993c91f45db6e624ca450e62ade5d73ab80294ace73
font_01_sfnt_off00006ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF0 10352 bytes
SHA-256: c27b7336b4b4c9312fdddc8d33950cc9aa1d412fb240bfbf956178a9d11cec31

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