Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e9e5f8c28bec01…

MALICIOUS

PDF

82.5 KB Created: 2021-02-25 16:55:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 814720b1b808c68daf609a1a62b0bfa1 SHA-1: 60a48b57a407078dcfcc3af0ca0bf0146f939dcc SHA-256: 88e9e5f8c28bec01fa25d090fc67e24c55edb12f9ee86328431f774d90334c18
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services like Weebly, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/award?keyword=v+shred+weight+loss PDF link annotation
    • https://bajiwiga.weebly.com/uploads/1/3/1/3/131379875/7979067.pdfIn PDF document text
    • https://rujafamuzesoka.weebly.com/uploads/1/3/5/3/135339602/legaki.pdfIn PDF document text
    • https://mepubigavij.weebly.com/uploads/1/3/4/5/134599646/fadotuvupobepu.pdfIn PDF document text
    • https://xoluvaxabezil.weebly.com/uploads/1/3/4/3/134338990/kinovanoju-gipasa-lixib-marade.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/perawokuponoke.pdfIn PDF document text
    • https://kikoxelila.weebly.com/uploads/1/3/4/3/134335894/02f53f2f96a18.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/pgjlicA/xazajijogexosu.pdfIn PDF document text
    • https://pefeluleno.weebly.com/uploads/1/3/4/6/134698673/4677846.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/jgtU7jb/lalexamowemikixavunof.pdfIn PDF document text
    • http://bahis-sikayet.com/anonymous_police_report_san_diegog6ny8.pdfIn PDF document text
    • https://futafapegimato.weebly.com/uploads/1/3/1/8/131855997/d72e7ad1e327.pdfIn PDF document text
    • https://fadirepux.weebly.com/uploads/1/3/1/4/131438814/efc4e0a07a69e.pdfIn PDF document text
    • https://lexedixejorew.weebly.com/uploads/1/3/1/4/131438453/2185593.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/6c6483864c.pdfIn PDF document text
    • https://cdn.sqhk.co/jetekujob/fjcdjfi/93582365552.pdfIn PDF document text
    • http://zarabotok.space/call_letter_for_job_formatnikpi.pdfIn PDF document text
    • http://fuwefepor.iblogger.org/goxuwamisoxedelekewijiw.pdfIn PDF document text
    • http://urro-hu.com/redukebogl144k.pdfIn PDF document text
    • https://nironaguvotu.weebly.com/uploads/1/3/4/5/134530025/2dfdc64747e4a20.pdfIn PDF document text
    • https://cdn.sqhk.co/lufasawo/hggBgcd/zegijerabogimi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lirofad.epizy.com/shark_professional_steam_mop_how_to_use.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_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 4932 bytes
SHA-256: 5e05eedfb87dd2d84e96cdaf2df2c9c09ebd0b30bb751620011a99958823959a
font_01_sfnt_off00011922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11922 10440 bytes
SHA-256: 222405502993cdaff97aa34d02888d3fa2ecb020a38de462ac16163802182c66

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