Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e97eeb58be247a3…

MALICIOUS

PDF

72.8 KB Created: 2021-05-15 20:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e5b871faf7a20fccd6d238f2c6884e00 SHA-1: ed468500457bc69cfbc95652badb547fff6121bb SHA-256: 4e97eeb58be247a3bc4b437a965557a044d50886005daec17f90d7fb019e6ab9
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The document body's deceptive title and the heuristic firings indicating a malicious redirector and a link farm on disposable hosting strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

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
  • 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 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://crophysi.ru/strik?utm_term=how+to+get+a+knot+out+of+a+tow+rope In PDF document text
    • https://foxanebipukete.weebly.com/uploads/1/3/4/3/134309218/tebik-bakepomokifineb-jurimilifaje-rilat.pdfIn PDF document text
    • http://tifetatujuvib.22web.org/associations_incorporation_act_2020.pdfIn PDF document text
    • http://vadozawemowo.iblogger.org/fifonakivakerutidozir.pdfIn PDF document text
    • https://manabuvajej.weebly.com/uploads/1/3/4/8/134847277/7761220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473340/normal_603594f38ee66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_6031dec490848.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekapalipewux.epizy.com/third_conditional_perfect_english_grammar.pdfIn PDF document text
    • http://vesunisiwu.rf.gd/57773359880.pdfIn PDF document text
    • http://xapitolo.rf.gd/74441629529.pdfIn PDF document text
    • http://bobofawas.rf.gd/ansel_adams_born_free_and_equal.pdfIn PDF document text
    • http://zazujipediwa.rf.gd/tizowifodirutajudejotuf.pdfIn PDF document text
    • http://vuzadixatine.epizy.com/79817965151.pdfIn PDF document text
    • http://muwovulal.epizy.com/bugaromokagazefijef.pdfIn PDF document text
    • http://kuxatirimupuv.rf.gd/black_and_decker_20v_lithium_trimmer_parts.pdfIn PDF document text
    • http://mirajiletumumi.epizy.com/anatomy_of_eye_free_download.pdfIn PDF document text
    • http://gozusufopam.epizy.com/25848368310.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_off0000df9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9B 4976 bytes
SHA-256: f8607a219b6a881af7499c626e63b77eaf2c5bcaaf08c974d861e88841c8c3dc
font_01_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 11040 bytes
SHA-256: d757cb1ccb0be3264d9228c58d64f8f340d3976a4a160f44f953bbff38f493dc

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