Malicious PDF — malware analysis report

Static analysis result for SHA-256 9335eb97e6232983…

MALICIOUS

PDF

44.4 KB Created: 2020-10-06 16:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 9136382434dec9f255d66b18fbe6ee6e SHA-1: 1a001c8502602717268d2ca6f72a7c460ea1464c SHA-256: 9335eb97e6232983c05a202f2f1455fae473193114aa84593e6ac110d4a3d164
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=caliban+s+war+pdf In PDF document text
    • http://files.colonialcandlesandmore.com/uploads/1/3/0/8/130813642/2f01d722b2.pdfIn PDF document text
    • http://files.hmongstudiesjournal.org/uploads/1/3/0/9/130969048/1166394.pdfIn PDF document text
    • http://files.dudleyfoundation.org/uploads/1/3/1/4/131407406/e939b659872d.pdfIn PDF document text
    • http://files.cebsnyc.org/uploads/1/3/2/7/132740498/bd08a2091669.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/384be990-6bbd-4b7f-8c13-d1a1ff008e24/13431929806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbef58cf-27cd-459b-aa9d-6d6593fc4e19/gafonel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04b93a8-10e8-4a3a-9ae1-a0e002df5066/xixoxobanatapuzaniledolal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7b39de-e64d-4a2d-a9d8-74f0a9506003/burexev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a29d75d2-0ec6-474d-a9a7-c818d52b9af8/vasujofelazad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a631cbf-5937-4296-bd9a-030bdab80542/22704482946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b9bf11c-e55b-4059-abe6-0891fbd3a143/murutuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474fa85f-2c07-4adb-a098-2f86664f90fa/983036584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66db6f10-1996-4a14-871a-ca933d6b43e8/bimixitirazajerozewowaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/510667e6-93c5-475f-adfb-25133b5723d5/38844892560.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_off00006e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8F 5172 bytes
SHA-256: be54d1891555b6cae3cce9b99fb117fee922936fc1d729a154642ff624e9e95e
font_01_sfnt_off0000803a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x803A 11560 bytes
SHA-256: 4ca0886956221237ede70049b7548ca8f71b613843b91c1aca58172b1e19f6e6

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