Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5f3ce37cfcc5c9…

MALICIOUS

PDF

83.4 KB Created: 2021-03-09 10:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7cdf62ee3f53d1d39f3e512325bad22a SHA-1: 9387e491f342ea1d2cd391f502de2080d2ef82d8 SHA-256: cd5f3ce37cfcc5c986928d343f845e2aa29f47e1fbeadc4d5439c7288247aaab
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to potentially malicious sites. The embedded URLs and the heuristic findings strongly indicate a phishing or link-farming attack pattern.

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://baarspo.ru/aws?utm_term=how+much+should+i+charge+for+a+logo PDF link annotation
    • https://cdn.sqhk.co/zovaratigu/aij4ljh/89968714191.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/mary_rowlandson_puritan.pdfIn PDF document text
    • https://cdn.sqhk.co/likunubiba/Ygjgchh/dinos_online_unknown_enemy_mod_download.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/7973661.pdfIn PDF document text
    • https://sasopezanureje.weebly.com/uploads/1/3/4/6/134691995/zanumu.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/sgL6Bhj/tasopobubi.pdfIn PDF document text
    • http://laxelenokuro.22web.org/xepuzinopikow.pdfIn PDF document text
    • https://viwalamul.weebly.com/uploads/1/3/3/9/133997630/401247.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/93920543240.pdfIn PDF document text
    • https://bivuremopukojez.weebly.com/uploads/1/3/0/7/130740249/dc277.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/fakejitegu.pdfIn PDF document text
    • https://wufonujixu.weebly.com/uploads/1/3/4/3/134386315/wopewevekexekut_vusibujob_kazezupaxu.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/dark_disciple_arc.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://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_95a8ec031b90421f860bcc6b88fe35b6.pdf?index=trueIn PDF document text
    • http://gadoxijumulop.epizy.com/74520490796.pdfIn PDF document text
    • http://wovotunuvovon.epizy.com/decimalformat_java_example.pdfIn PDF document text
    • http://siwebojik.epizy.com/strategic_business_plan_template_powerpoint.pdfIn PDF document text
    • http://rapabilalame.rf.gd/body_parts_of_animals_worksheet.pdfIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_f98703701f164c2c98d684fe2bdc12ee.pdf?index=trueIn PDF document text
    • http://kazizalogovake.rf.gd/49543220394.pdfIn PDF document text
    • http://satuzolo.epizy.com/lepolokisa.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_75332fbaa40d49f7a4c37f492118d1df.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 5184 bytes
SHA-256: 446c39f92900e95ea95daf0951d81b1e8068306d1870996e9bdce09ea5c62b28
font_01_sfnt_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 10320 bytes
SHA-256: d7e7fced9b465df53370208e81519557727fd3b076cf3b036439feac4ff242f0
font_02_sfnt_off0001317a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c