Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cda67c8ad4426b…

MALICIOUS

PDF

70.0 KB Created: 2021-01-04 22:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 38d10369899f99929e52488eb33bfc48 SHA-1: 501f52e090a0473b4df8474d39ec28b0c62bd1af SHA-256: 67cda67c8ad4426b67e4d8167b7e669eafa8aefc3f899d5f2751fd2041531f2b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external PDF files, indicating a link farm or a phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=bts+world+heartbeat+song PDF link annotation
    • https://cdn.sqhk.co/soletibedix/ZINJc8W/wuninalal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497078/normal_5fea00fdd6297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5fdafed7e7e0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5f9bff7383521.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366639/normal_5fef80cbc2598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485821/normal_5fb466f9daeed.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/gehd9gj/josaledabixariluwikizi.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/BXigGYN/77465522546.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/farekufekuxovul-venop-kelutuxew.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/fNhhsKx/digi_reload_rm100_for_how_many_days.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5f912d2653ffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5f95defe5a24d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/excel_sheet_reference_name.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_off0000d1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DA 5368 bytes
SHA-256: ff6ffc16e2d5f4c96f08a41185168a8e800f328a02c0b61c9b48eb84a9e33dd0
font_01_sfnt_off0000e420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE420 12740 bytes
SHA-256: 240fc87666411a42c1020077024779f7e1f040dc8df0461ccf54728dfdf80735

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