Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2e18f2e4e8df56…

MALICIOUS

PDF

81.1 KB Created: 2021-01-05 21:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d826fd010a654aa4acc79621bdb80016 SHA-1: e97d5a0e5eadfbfa5ffe76b278aafa248fe6c332 SHA-256: cf2e18f2e4e8df566c89bb9cc49cfce11afe6a8dc2e240a4b28a59218ead21a4
186 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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=what+is+an+example+of+deterrence PDF link annotation
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/146348d3.pdfIn PDF document text
    • https://cdn.sqhk.co/samigimas/gjbyojh/vudojasarekunabumag.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/LCTUFge/95723695092.pdfIn PDF document text
    • https://vaviwajefumizin.weebly.com/uploads/1/3/5/3/135348181/saboxuna.pdfIn PDF document text
    • https://kulufitobapesad.weebly.com/uploads/1/3/4/4/134443603/fonexilem.pdfIn PDF document text
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/gajipa.pdfIn PDF document text
    • https://vodesaladamaju.weebly.com/uploads/1/3/5/2/135298616/5ed9b400744.pdfIn PDF document text
    • https://werudugin.weebly.com/uploads/1/3/0/8/130873895/6863425.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/fjgW3a1/bimuzudavavabusekew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_5fc346c21a4d0.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/gewuwasi/converse_hoodie_women_s_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/formal_definition_of_arguing.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/39104562977.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_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 5476 bytes
SHA-256: 4cd5a53e40497b24041a9f6feccc4e4e531b0f3cdc69bcad75e5d8445ed9d13e
font_01_sfnt_off000111c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C2 11048 bytes
SHA-256: 2293db0446bd0d6b5f8080d9637bcc6eb7cf816e05ca5173d83480e40130921d

Open this report in the interactive analyzer, or submit your own file for analysis.