Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5cb7798cff06e8…

MALICIOUS

PDF

66.0 KB Created: 2020-12-23 17:06:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 81f37fbcd2e7cbb34465348993aecf43 SHA-1: e0ce3a10dc392e1b7a79364aef9e7c9ab8931992 SHA-256: cc5cb7798cff06e8d5917a268eca81ccabbe18d7afee6d586de3ecfa84288f2c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'traffset.ru', suggesting a link farm or phishing attempt. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to potentially harmful sites.

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://traffset.ru/aws?utm_term=free+blank+birthday+card+template+word PDF link annotation
    • https://kegilosibumu.weebly.com/uploads/1/3/4/5/134513635/tukugamobipimil-waniwa.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/zatadawuvap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_5f9433e8ae5b8.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/ca4b4a950d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5fa0c55b02365.pdfIn PDF document text
    • https://gudimutukadido.weebly.com/uploads/1/3/4/6/134648046/pafisijurujuk_mamekedusepa_sovedunimam_torimexe.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/panalipolifod/59101384828.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/16950587100.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/dexeweribesoxanolu.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/12354288951.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/94541188278.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_off0000c638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC638 5488 bytes
SHA-256: 2798f40972c2595aa4cf5d43ada1dce92a6c8923b47f8fc1b156e4a68b0bbe7d
font_01_sfnt_off0000d8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 10200 bytes
SHA-256: d7771825808ce9f813960a53af20f112d224c82786586bfd62d80d4f8e4dc064