Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3413f09dee06bfd…

MALICIOUS

PDF

83.3 KB Created: 2021-03-12 09:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8d9812498d9fbe23a5807d0dcf51b00e SHA-1: 91eca7bb3a81660328c2d403a056714de90e823d SHA-256: a3413f09dee06bfd67bc58fa5ee4d861c2833db105f1774d15ea1c55896e4099
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/123?utm_term=easy+personal+budget+excel+template PDF link annotation
    • https://penaveligatoka.weebly.com/uploads/1/3/4/3/134314422/jutikilesire.pdfIn PDF document text
    • http://6gusevshop.space/android_developer_tools_bundle6jffu.pdfIn PDF document text
    • https://cdn.sqhk.co/rutesawir/aX4yPbd/paint_sprayer_rental_cost.pdfIn PDF document text
    • http://differencecheats.net/christmas_math_worksheets_for_middle_schoolic0ep.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/P9xgicY/50699331093.pdfIn PDF document text
    • http://zenarajare.22web.org/lulud.pdfIn PDF document text
    • https://voladivilutefuj.weebly.com/uploads/1/3/4/5/134500748/fesukijesovaz.pdfIn PDF document text
    • http://risizotifapeju.iblogger.org/convert_kn_m3_to_lb_ft3.pdfIn PDF document text
    • https://cdn.sqhk.co/fajaleniwa/Svo6ghh/naxofajifatizinadasub.pdfIn PDF document text
    • https://wewivipumi.weebly.com/uploads/1/3/0/7/130775870/voganepitupuw.pdfIn PDF document text
    • http://info-pages.ru/the_norton_introduction_to_literature_portable_12th_edition_onlinefjby8.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/457421.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/f55Dgee/twisty_road_san_francisco.pdfIn PDF document text
    • http://fixegemixinazoj.22web.org/99792760248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_2af2e09ec0204143afe52f8ff158439f.pdf?index=trueIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_8d1b531fe90143ada910ffb9bb48cefc.pdf?index=trueIn PDF document text
    • https://a3f0f489-8083-4a9a-8fa3-2e40fe1a5f8e.filesusr.com/ugd/39a0fd_4939f29764174b77b964b27d6135773c.pdf?index=trueIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_dcb4a3ce87ca42e885b5694820b608a9.pdf?index=trueIn PDF document text
    • http://fukokisofor.epizy.com/reduce_mac_os.pdfIn PDF document text
    • http://witigunakejawi.rf.gd/wutozesubudamix.pdfIn PDF document text
    • http://sodebaxekigefip.rf.gd/wodewurolovapas.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_03993abcbc6f4098ab1133e0caa123e6.pdf?index=trueIn 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_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 5660 bytes
SHA-256: eb92b0477b3786fe43e009fc1cd8eb2cfe6af8cbe6438e465df2e9d645407f6b
font_01_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 11548 bytes
SHA-256: 8d7e5f749d6515e7f9d4080548222d8ffd5f548ff4a3ced784a1eedb55805d4c