Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23723732cbd7011…

MALICIOUS

PDF

64.1 KB Created: 2020-11-10 23:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 4d77e02bd813afc4c96e51d09c25e10f SHA-1: a5cb887e6287d2c06e9bd7138209be467e0ea099 SHA-256: e23723732cbd701185753e35a6e6dfc9a2f2a7208e2bc118adaa9a26b668d93f
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?keyword=adam+krabbenhoft+fargo In PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/revezurofow.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/c91cbc83-5247-4bec-a768-6c69ae2fac4a/jitumomunureniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbcb06da-c5e3-4b29-bd00-9eea493fcfa8/botufidobixafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f14b42-73e6-405d-9566-e53391f84550/xulenemud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368b32e0-65ce-447f-a76d-d3d02fc2d509/nudekiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5607177-a357-4658-99c5-8eba4a9d21d9/jugozotu.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/vawivobofatilukotinereven.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/37147512589.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/datofexesosesugalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/575a8140-86c9-415a-8748-8ac2d78c3a3e/5310323591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cea75d5-e355-4f8f-8018-382ba7991018/19798187816.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/watch_the_grudge_2020_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/degerutisig/82315507735.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_off0000bf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF91 5304 bytes
SHA-256: 39281a875927fac246853bb293c6bc3b4a91bdba8acbd15686fd436fdb08a485
font_01_sfnt_off0000d179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD179 10120 bytes
SHA-256: 6c8ca9d85a616354f43babdcccb09ff3fcf3da5821301bc8809412b7a3747f30

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