Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e1b64320638aab…

MALICIOUS

PDF

41.0 KB Created: 2020-10-04 17:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 911d39835dcef6fc596d28495a06592b SHA-1: f2cfc9de85fbcd0dd681b8528f30e51e6ce65e07 SHA-256: 73e1b64320638aabfa948b716c775e162fcf1362d2db28151210bfe5017b0ab7
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=subject+matter+expert+job+description+pdf In PDF document text
    • https://site-1036644.mozfiles.com/files/1036644/76907310107.pdfIn PDF document text
    • https://site-1037860.mozfiles.com/files/1037860/33530535648.pdfIn PDF document text
    • https://site-1039998.mozfiles.com/files/1039998/zezazetobelakole.pdfIn PDF document text
    • http://dopuxur.trinalang.com/uploads/1/3/1/3/131383314/1f4313075.pdfIn PDF document text
    • http://lumulu.paraglidinginjapan.com/uploads/1/3/1/3/131398563/782813.pdfIn PDF document text
    • http://fekirejaw.marinerwrites.com/uploads/1/3/0/7/130739693/numaf.pdfIn PDF document text
    • http://files.skycampgreenwich.org/uploads/1/3/0/8/130814172/zavifosulugabepig.pdfIn PDF document text
    • http://zerewa.merakihh.com.au/uploads/1/3/2/6/132695601/e2f43aa21868.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/5e27c7a6-f25b-4c18-8f55-7ab37b29a1b9/sopiwimisujawodelanado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3389580a-74c4-457b-a502-816f4b8b64a7/73066504046.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/6968/7958/files/pathfinder_feat_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6587/9957/files/natazenozimipozibanuduti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3423/7333/files/soil_engineering_and_testing_consultants.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/separation_and_qualitative_determination_of_cations_and_anions.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_off00006237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6237 5656 bytes
SHA-256: 68d8c258fd85ab018caa68de87090bdc3657043f1bc4c7edd89218e5c36cc832
font_01_sfnt_off0000755b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x755B 9992 bytes
SHA-256: bdbd5cf0ea0610272fe7b971372b921e8edd123045fb6a64e3c547847c7272c4

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