Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f8622f7c8c0feb…

MALICIOUS

PDF

63.9 KB Created: 2021-01-23 20:20:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1b786589ed7f10cc73003eb35e6ee847 SHA-1: e399b4736bef7cb926d2bb76845c8431ffbd3dd5 SHA-256: b5f8622f7c8c0febf25874ab45f06ad8d7712eca48f53fe972d13cee2c144d0a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of a large number of external links, including one pointing to 'traffset.ru', suggests a phishing or link-farming attack. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffset.ru/123?utm_term=why+did+they+arrest+the+automobile+factory+worker PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420745/normal_5fd6383144a66.pdfIn PDF document text
    • https://site-1175553.mozfiles.com/files/1175553/74563903190.pdfIn PDF document text
    • https://site-1191564.mozfiles.com/files/1191564/leave_announcement_letter_format.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/jhhfhCf/rulifeduwulidumugagunu.pdfIn PDF document text
    • https://gumewixolasadaz.weebly.com/uploads/1/3/4/6/134659592/tavuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476123/normal_5fdf6f5f06e75.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/magakijaw.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/idZgjTJ/pefaritupi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490380/normal_5fe01e81f0233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412159/normal_5ff1707d5aee9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424364/normal_5fcbe6d2c4785.pdfIn PDF document text
    • https://site-1176622.mozfiles.com/files/1176622/28582741070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464730/normal_5fd1eeb446b88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379229/normal_5fc67de21761a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489839/normal_5fef6926b6956.pdfIn PDF document text
    • https://cdn.sqhk.co/bexexoro/iQRhfja/91117443404.pdfIn PDF document text
    • https://site-1168299.mozfiles.com/files/1168299/gigesogeviz.pdfIn PDF document text
    • https://cdn.sqhk.co/sevimifogu/ibWgfUO/bemiwolekisabowukin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jodaniti.epizy.com/excel_2007_delete_sheet_greyed_out.pdfIn PDF document text
    • http://tukudapig.epizy.com/well_water_treatment_for_coliform.pdfIn PDF document text
    • http://bavajozobe.epizy.com/upcoming_android_wear_os_watches.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_off0000bcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFB 5672 bytes
SHA-256: 297500dd21cb2e4ea2c391265312c41d1f73197914463ac2635ff1495a271dc6
font_01_sfnt_off0000d03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03B 9832 bytes
SHA-256: 5f13dd582a3bb4a26aeab24ab3c948741592b5675a57929a3835318639e74bad

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