Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcc759df630cf9c…

MALICIOUS

PDF

60.0 KB Created: 2020-11-20 09:13:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 39dbf34bd922b8984a6363b2b2b3adf5 SHA-1: 1183e1eaa14981bd92d9e6d45d99ea36bd46e563 SHA-256: 4dcc759df630cf9ce2ffcb21412bca5d155a8a8f2de296dd26ffa96b41fd8f84
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?utm_term=death+of+the+family+joker+figure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475379/normal_5fab897e3c6f2.pdfIn PDF document text
    • https://fiwenozagor.weebly.com/uploads/1/3/4/3/134363395/vijopozow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_5f8d01d3eb817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408719/normal_5fb519067d669.pdfIn PDF document text
    • https://jupovibofekek.weebly.com/uploads/1/3/4/4/134490290/9098473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413121/normal_5fa0483b7a088.pdfIn PDF document text
    • https://tumipipap.weebly.com/uploads/1/3/4/5/134598024/6746847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5f90075c58304.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/736ad321-7bc9-43a0-b712-59708d3bb71e/acronis_true_image_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90a00ba8-63d9-4140-a98c-ccd77e67435d/lowes_assessment_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3bb19fb-ff79-4ad7-9367-c80e43708e35/60234331063.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_off0000ae7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7F 5244 bytes
SHA-256: 866bada4ee294ef776ae64a91bf5e2aa123e29bd70465283bfa5cb2b1838614c
font_01_sfnt_off0000c049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC049 10372 bytes
SHA-256: 68c6cfb41d20718a554ed9996dc2fb4090bed955dbd9bef4af152c2f54800fee