Malicious PDF — malware analysis report

Static analysis result for SHA-256 433894ed02a4c22d…

MALICIOUS

PDF

76.0 KB Created: 2021-02-12 03:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 866191d0cbada44ea8d8c0a5cee65f58 SHA-1: a011b45a8008d481a08278fb7e6668a66ea1ce66 SHA-256: 433894ed02a4c22dadfa9b50ba2f944e6570a2daef23ed201cc7ef5ce17f7b22
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/wix?keyword=diane+gaidry+age PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417531/normal_5fe6e8bcc8f09.pdfIn PDF document text
    • http://biomanix.best/66612385716lmug4.pdfIn PDF document text
    • http://citrus-fruit.space/activities_for_developing_critical_thinking_skillskbhh2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413236/normal_5fe2d82e169ab.pdfIn PDF document text
    • https://rasazumeg.weebly.com/uploads/1/3/1/4/131454762/d9ce7.pdfIn PDF document text
    • https://zajilonuxiwez.weebly.com/uploads/1/3/4/8/134871265/62582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_602431c2a1d1d.pdfIn PDF document text
    • https://veminimuvaw.weebly.com/uploads/1/3/4/6/134630651/mivoreket.pdfIn PDF document text
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/gusipu.pdfIn PDF document text
    • http://vulgargirls.fun/musica_gratis_iphonekm3gq.pdfIn PDF document text
    • http://cosmostil.top/mobilepay_app_stored8q2z.pdfIn PDF document text
    • http://ita-bio.fun/summary_of_day_of_infamy_speechucny7.pdfIn PDF document text
    • http://gmetry.online/gimowaligasulocxmjl.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/Zjjhiht/homes_for_sale_in_the_bahamas_islands.pdfIn PDF document text
    • https://rajuputodetu.weebly.com/uploads/1/3/4/6/134682309/3123725.pdfIn PDF document text
    • http://fastdonwload.space/31143602774ixbqu.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/tetamofatinod.pdfIn PDF document text
    • http://harmony-market.ru/74940368757oej49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 4884 bytes
SHA-256: 525bd11194c5e1e0866ea811ec15600f7c7aa26531855652001dd8119c55be93
font_01_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 10140 bytes
SHA-256: 81f90ce0211fd38b26d4881fee2f0328886cd508e7b6602a6cfa816dac361234

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