Malicious PDF — malware analysis report

Static analysis result for SHA-256 173ec3abbca652b4…

MALICIOUS

PDF

74.6 KB Created: 2021-02-28 12:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e6008623f900a6c02b3e744b84f24046 SHA-1: 428fd792962efbfb07a45924ab206b01c419200a SHA-256: 173ec3abbca652b49ae91b0de5fdc04dfb06ccaf144ba119ee779b76592f7462
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URL 'https://kuzutuzo.ru/wix?keyword=kingroot+apk+4.1.0.703' and the PDF link 'http://sevotapapi.22web.org/bikizajavew.pdf' are key indicators of malicious intent, likely leading to phishing or malware downloads. No scripts were extracted, but the PDF structure and external links suggest a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/wix?keyword=kingroot+apk+4.1.0.703 PDF link annotation
    • http://sevotapapi.22web.org/bikizajavew.pdfIn PDF document text
    • http://gexisefi.iblogger.org/54216674668.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/guwebujokuzaxerupevuxit.pdfIn PDF document text
    • http://shoppingyxplus.xyz/cambridge_english_dictionary_booksfq51.pdfIn PDF document text
    • http://xuzejomuxide.22web.org/wejaf.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/wild_magic_tamora_pierce_audiobook.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/62840687233.pdfIn PDF document text
    • http://lonavipesikebe.iblogger.org/negaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dunipuxok.rf.gd/what_is_the_financial_function_in_excel.pdfIn PDF document text
    • http://menoziduwuju.epizy.com/affidavit_annexure_cover_sheet_nsw.pdfIn PDF document text
    • http://nonibil.epizy.com/54154106433.pdfIn PDF document text
    • http://girofili.myartsonline.com/which_word_does_not_belong_delicate_frivolous_illumination_kindle_opaque.pdfIn PDF document text
    • http://memekafese.rf.gd/51465718283.pdfIn PDF document text
    • http://jinixoxugud.rf.gd/tajibuka.pdfIn PDF document text
    • http://gefegasoro.epizy.com/papedikipujubobibef.pdfIn PDF document text
    • http://livirava.atwebpages.com/78974939572.pdfIn PDF document text
    • http://kodataruturi.rf.gd/36424246240.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FE 5368 bytes
SHA-256: 2b46ebf6d366fa1d38137cf4461abac0a2580e4f42120ba2b3583841d82c5a9a
font_01_sfnt_off0000e57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 10292 bytes
SHA-256: c78d27594ea5dbe6219dd4d9864f80d384e344ad2d384a81c171665d2c3bd473
font_02_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67