Malicious PDF — malware analysis report

Static analysis result for SHA-256 e744fb1f8c643a87…

MALICIOUS

PDF

62.1 KB Created: 2020-11-20 09:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f80508b7ce52aee10d1ba207dfb1c6d0 SHA-1: df80cda22bd8b80a2664cd977097243c1b6ebd5f SHA-256: e744fb1f8c643a87003383231ba8d9f7747ff9b27ebc462642b54879ce3c71de
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/aws?utm_term=hhmi+phylogenetic+trees+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406516/normal_5fa9e6152432a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418367/normal_5f984a7019584.pdfIn PDF document text
    • https://dilukali.weebly.com/uploads/1/3/4/5/134584555/pajonipakonu-gudogorigufinum-xobijufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_5fa7d6c2b14b2.pdfIn PDF document text
    • https://likivaduzizi.weebly.com/uploads/1/3/4/6/134699319/duleko-gadibajew-vametidodesojox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f8712fbd21c1.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/43632d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470679/normal_5fb6940f1f378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417527/normal_5fab9ee8b1cab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_5f915d85d8d63.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/zirojopemup/xirotitavolokaropa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452f9a2e-99ad-470e-a504-1267e3cfeccc/kikenewarukemaseti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d6c259a-dc3a-4c2a-8357-e8e17af1c09d/26391168354.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_off0000b4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D7 5568 bytes
SHA-256: 3adbe0be8b08273a65da7b1bc1074589510643de3c28170f982ee483a6ebadd7
font_01_sfnt_off0000c7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BA 10620 bytes
SHA-256: 9a5c105f1ebb0a4444ab4fd1a21f30110f7ede5d637eefffe470175dd655b68c

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