Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a1672f479067c5…

MALICIOUS

PDF

74.1 KB Created: 2021-02-24 03:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bd811a667d7e15e6107436b06a573c15 SHA-1: ef0b34a6fb77644c530293a9f3ec5b21740472d4 SHA-256: e5a1672f479067c590afc8dad2c75d3856c53088f346d0fa700b9bce606916bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM'. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the structure and numerous external URLs suggest the document is designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

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://jacksth.ru/123?utm_term=how+to+program+logic+controllers PDF link annotation
    • http://bit7.top/61849930782j8tuw.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/a9c8dadb3787.pdfIn PDF document text
    • http://uablog.website/powegobokizujimgdk6.pdfIn PDF document text
    • http://insurancecarusa.com/asus_rt-ac68u_dd-wrt_vs_merlin0vwew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384470/normal_601432a9cc6a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413590/normal_5ff8d82a3ea8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_600a6072e2e1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386828/normal_5febe0acc1591.pdfIn PDF document text
    • https://rogupogadagome.weebly.com/uploads/1/3/1/3/131398605/mererawuruneveveb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463810/normal_5fc8bb19800c0.pdfIn PDF document text
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/5ec13.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/2721173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458852/normal_5ffa6b645a4a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443619/normal_5fde65d320cce.pdfIn PDF document text
    • https://misirukizos.weebly.com/uploads/1/3/4/0/134017349/30f49c5f4c6d5.pdfIn PDF document text
    • https://mapaluloxusogor.weebly.com/uploads/1/3/0/7/130739646/2423186.pdfIn PDF document text
    • https://sowematawenuw.weebly.com/uploads/1/3/1/1/131164153/pipuwipi.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/jcjgdyD/84762796993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fe6db7003e3d.pdfIn PDF document text
    • https://tazomisoz.weebly.com/uploads/1/3/4/3/134344853/zodemikulojeti-kuxavalemiri-waduxegipam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 5304 bytes
SHA-256: e1adcd9f0f2700a4d4e8183b1754532af8594a1bf028d799b3fb4c8eaf98c1ed
font_01_sfnt_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 10740 bytes
SHA-256: 4a845b923923fcc2caa91c40afe5c088077912fedef3d66f7c2284a51dc1a507

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