Malicious PDF — malware analysis report

Static analysis result for SHA-256 78726ce8fb8cba3a…

MALICIOUS

PDF

71.1 KB Created: 2020-12-31 16:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 93988699e8bc91d55ee9ac657c79aaa2 SHA-1: c0bc3efc56feaec318142cb15250fd2cfc3efaf4 SHA-256: 78726ce8fb8cba3a85968e5ef7a3692944ef7c9c949409fd48e96a5bd72addcc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The embedded URLs and the heuristic firings indicate that this document is designed to redirect users to malicious websites, likely for further exploitation or credential harvesting. The ClamAV detection and ML classifier strongly support its malicious nature.

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
  • 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.
  • 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://trafffi.ru/123?utm_term=arrival+pelicula+completa+en+espa%25C3%25B1ol+latino+online PDF link annotation
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/siwejutifub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451954/normal_5fc9890c561e0.pdfIn PDF document text
    • https://pavaliwakugaban.weebly.com/uploads/1/3/4/3/134373235/mekobaxekuduvet.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/Vltc6op/16546655403.pdfIn PDF document text
    • https://cdn.sqhk.co/rejibebadit/xjcjil0/no_man_s_sky_playstation_vr_review.pdfIn PDF document text
    • https://badasemo.weebly.com/uploads/1/3/4/4/134482086/pomefonivo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412895/normal_5fe3a66699289.pdfIn PDF document text
    • https://lavigepes.weebly.com/uploads/1/3/4/4/134437347/4528093.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/jadik-sofawokamu-guvezexom-poripukej.pdfIn PDF document text
    • https://papokerudinex.weebly.com/uploads/1/3/4/3/134310480/3893955.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/be7fc7bf6.pdfIn PDF document text
    • https://xasejudezorakoz.weebly.com/uploads/1/3/0/8/130813307/gaforimuvonata.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/5897634.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/sulasatevirexo/arduino_interrupt_example.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_off0000d61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61A 5340 bytes
SHA-256: 9225408069065d1c4d018b03089d32dea53006233d1ca9997a8e115d8f555f75
font_01_sfnt_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 11292 bytes
SHA-256: 07162e0ba10f60d00bdceead6bbfdbeda44b665ab8956d59a91865684f15575c

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