Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c5b60ec7a19dcf…

MALICIOUS

PDF

79.9 KB Created: 2021-02-17 13:41:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ee4e57c745df59824b6619750e3e7aaa SHA-1: 1df37efe92cc36aa7d2d7c610dc7bb8fba725d7f SHA-256: 66c5b60ec7a19dcfea3d82cdbb1413ba54b5cb76c8a5576090971c18313f5208
244 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 and routes users through malicious redirector infrastructure. 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-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://yafferge.ru/123?utm_term=how+to+measure+cardiothoracic+ratio In PDF document text
    • https://bogezemobazuv.weebly.com/uploads/1/3/1/8/131856224/jimuzebebu_gorinu.pdfIn PDF document text
    • https://fowinojosusine.weebly.com/uploads/1/3/4/4/134495991/losisaririped.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_6023cb44e1cb8.pdfIn PDF document text
    • https://befutoxe.weebly.com/uploads/1/3/4/4/134443098/sogadixanikugipagoro.pdfIn PDF document text
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/64535f8.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/fghcjht/cnc_machinist_jobs_in_odessa_tx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485173/normal_5ff713283ddfd.pdfIn PDF document text
    • https://jenitexul.weebly.com/uploads/1/3/4/8/134859983/balinetefesasig-powefutatofajup-fufunulinobuso-bukeziduxaribik.pdfIn PDF document text
    • https://gotagifegu.weebly.com/uploads/1/3/1/6/131607164/22b7c81c83d5b1c.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/ff3e0174f69f8.pdfIn PDF document text
    • https://cdn.sqhk.co/fekurisakez/fhejcaQ/97264329896.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lebejos/crossfit_workouts_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/24644820832.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 4976 bytes
SHA-256: fa3fb8b0272572ce87fdf928bfe8564f6131d7fc0032e4edd037ece3160261fd
font_01_sfnt_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 11252 bytes
SHA-256: b55546313c6be696c8051430cc55cafe37b1eac0e50592097c283c2d3adb9956
font_02_sfnt_off0001242a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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