Malicious PDF — malware analysis report

Static analysis result for SHA-256 444bdfb35cd20c44…

MALICIOUS

PDF

86.2 KB Created: 2021-01-06 06:02:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a00b1acbe9494cf6b44f6ccfda1badbd SHA-1: 72ab2b7fe3d7d60617b360d1a1d6b0ecc405e67c SHA-256: 444bdfb35cd20c44c9009c600047eb6ae3ef7843da9d4d450a1db6c69ae82319
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a download button lure further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=creative+cv+template+doc+free In PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/lipew.pdfIn PDF document text
    • https://xevosafodom.weebly.com/uploads/1/3/4/7/134739965/bufogovewimakepe.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/fcfeb0b2-d3c8-4512-a152-f03324ac6c3b/james_berryman_obituary.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/sulezolatuzinukuk.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/65185501884.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/bizexuwemowiwaporukoxaje.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/zuloruraxadedoju.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/gevozixugudusoxer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6656519c-e1a4-4136-abee-fee9a81ff56e/29335885652.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/u._s._news_world_report_cars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e831d22-7ab0-4714-88a7-fc7dcd75f240/50803270124.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_off00011636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 5088 bytes
SHA-256: fbe69d1ac9a8f4965ee3e32c3fa316650e1c0da5bfa9f78b6bdd585061225145
font_01_sfnt_off00012770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 10820 bytes
SHA-256: 133e872c56de5d77d8ccd0b9ad9a04191831f4cbd1b6faf45fd5ae1bc2a8a7d7

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