Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ce38d3983a6c5e…

MALICIOUS

PDF

67.6 KB Created: 2020-11-23 00:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ad73895060dd3d2ea6cf21c04b209441 SHA-1: 9d4eb2538618e2febedced2547faa160ca710a06 SHA-256: 43ce38d3983a6c5e91ed638a01e44da4045adef0111d396b72dd2f89cb5e87a0
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed for SEO manipulation or phishing. One critical heuristic identified a link to known malicious redirector infrastructure at 'traffking.ru'. While no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or malicious redirection attempt.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/123?utm_term=kuta+software+graphing+lines+answers In PDF document text
    • https://kinimozudex.weebly.com/uploads/1/3/4/4/134498073/zedegixuvijar-pivubovejam.pdfIn PDF document text
    • https://zonisobeb.weebly.com/uploads/1/3/4/3/134333784/vanolalazok-puboxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_5f95a60628e83.pdfIn PDF document text
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/zidude_viwajadefefa_jadatevifuke.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/9276785.pdfIn PDF document text
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/sizobawidopibamir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_5f976144baa2f.pdfIn PDF document text
    • https://lewotivegil.weebly.com/uploads/1/3/4/3/134320996/sufod_veverisubov_danifepupudu.pdfIn PDF document text
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/feee3c.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/673aec24-ed82-4762-860a-8bdb7db4f1af/dazewebobogirojogofut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7621ff9b-1752-4697-b6b3-6860b0ad5fbe/nike_youth_pants_size_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d538985f-4f61-47fb-b3a9-1d08f7be0c35/xutizotegavaz.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_off0000c994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC994 5224 bytes
SHA-256: 8968e4a28bedca550358a7264f9d8dea297761e5f58bb8be962778bf177117b8
font_01_sfnt_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 11232 bytes
SHA-256: c5c8cf9d7f995ec6d6b052dea0439bc578002220a9f40d925eee5cb3bcb00b52

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