Malicious PDF — malware analysis report

Static analysis result for SHA-256 c433726ae5e1b080…

MALICIOUS

PDF

73.9 KB Created: 2021-02-22 10:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2716442baeb547af70cc22369aab1270 SHA-1: 13b36dcb3aea036f2512cb01b4e2547bb52f3128 SHA-256: c433726ae5e1b080c6e1adde39b4fe8cc6c0b04115fe54365c405a1a62899e04
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary focus on 'https://jottigo.ru/wix?keyword=iphone+launcher+apk+3.1.4', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely related to phishing or malware delivery.

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://jottigo.ru/wix?keyword=iphone+launcher+apk+3.1.4 PDF link annotation
    • https://ramorebuba.weebly.com/uploads/1/3/4/8/134898890/9152205.pdfIn PDF document text
    • http://jejunobu.iblogger.org/gegekap.pdfIn PDF document text
    • http://nagesebaz.iblogger.org/ximutura.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387244/normal_5fe2345d26c5d.pdfIn PDF document text
    • http://xajoboki.iblogger.org/ririfakazitovokowexu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371783/normal_5ffe83074ab37.pdfIn PDF document text
    • http://dietnatur.fun/1983836953qxur2.pdfIn PDF document text
    • http://lonagonem.22web.org/amigurumi_patterns_free_download.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/nuzeniroponuled-xigowo-vosetezarijodet-kexidaramuvi.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
    • http://dasujisetojasel.epizy.com/58808826416.pdfIn PDF document text
    • http://midelex.epizy.com/apply_duplicate_marksheet_anna_university.pdfIn PDF document text
    • http://kovawasokagi.epizy.com/ritemumirukagaza.pdfIn PDF document text
    • http://babokad.epizy.com/old_navy_dress_code_policy.pdfIn PDF document text
    • http://niforubuduxema.epizy.com/22806718757.pdfIn PDF document text
    • http://voruluju.epizy.com/58041119678.pdfIn PDF document text
    • http://zexizel.epizy.com/libros_de_ortopedia_dental.pdfIn PDF document text
    • http://lifugefumiwikoz.epizy.com/how_to_do_an_origami_bird_step_by_step.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 4936 bytes
SHA-256: 620012511a6cb53f983d6eb748076f2c1a1442177dc14a3d9fdc9cabdb7d13d6
font_01_sfnt_off0000e8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D0 10428 bytes
SHA-256: bc86e58e8f2e48c327f2fe1b8d474dec95d37ea6d84426b92ba1b538497f422f
font_02_sfnt_off00010c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C83 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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