Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbf7e1d844735c7…

MALICIOUS

PDF

66.5 KB Created: 2020-11-13 00:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: af86f3a343fa14898d728de33cfafc30 SHA-1: dcfc3dff5dd3a0dd56cb673f1e79a892eb72898d SHA-256: efbf7e1d844735c79afdd24018a93a94a20509d92f1355056734e523022d7868
222 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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/aws?utm_term=whatsapp++pc+2019 In PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/xukevobegefabe-nimafuzu.pdfIn PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/652063.pdfIn PDF document text
    • https://sunuzokelegawo.weebly.com/uploads/1/3/4/4/134476032/5210885.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/bc080134-1b20-4ee0-8dc0-1afac417e0af/avengers_infinity_war_version_exten.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/rse_practice_skills_assessment_part_i.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fae0a0d-ac7d-4e45-8539-6e6b1f6a20c1/54317544017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e52769a-5190-4cd6-97a9-f270a187fe25/bodademegomukaveralibiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab20519-0e45-4ad4-b0e3-c0fa94f95a3f/20449291972.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/rokubudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240f4fe9-571e-41b0-9c7e-fdf743433434/cyberpunk_2020_humanity.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_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 5388 bytes
SHA-256: da2720873ae96550b2204c1eb2c32f75e3409a360b4c575288e902e6a2517fe2
font_01_sfnt_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 10160 bytes
SHA-256: 3a92af39c8b98d101759e4687e6a3ccd458b641203fc2e4bd732a8c6b5b9b570

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