Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d545482d41880e7…

MALICIOUS

PDF

114.2 KB Created: 2021-01-21 13:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2bb1de0a1a4388346f3661f609a67427 SHA-1: 7110ff76be367d8e4ad9f1fe5c5150ddbb9da75f SHA-256: 5d545482d41880e730ff8250078612e84708adb59bb5576235d2f7b74020725f
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly indicate malicious intent, likely involving the redirection of users to malicious sites.

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://bologen.ru/123?utm_term=buy+n+large+pixar+theory PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387060/normal_5feed64089c4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_5fbb45d77206b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501804/normal_5fe29b8211f92.pdfIn PDF document text
    • https://lumamiwaba.weebly.com/uploads/1/3/4/7/134735329/c8e6d31af80d28c.pdfIn PDF document text
    • http://sigonalen.22web.org/astrology_in_tamil_jyothisham_apk.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/gomogoka_wugerurusazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_5fa92f514cb55.pdfIn PDF document text
    • https://bazopozetera.weebly.com/uploads/1/3/1/6/131637116/ac83f1ca2cddb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476566/normal_5ff12efb196cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_5f957c6250a3e.pdfIn PDF document text
    • http://zubosoxi.22web.org/berotodoxa.pdfIn PDF document text
    • http://tizakeguwowil.22web.org/36395531207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f8714fec4854.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/donake/best_android_tv_series_app.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/boy_in_the_striped_pyjamas_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/latest_english_album_songs_free.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_off000183d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183D7 5124 bytes
SHA-256: aad9052f8257f9477894e6a28ca078ae0ad060a40262403935635cc0d730aa57
font_01_sfnt_off00019551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19551 11412 bytes
SHA-256: 0f8a995d5c83f7eaae098a3fd91b6c9ddb7b839eafd7607caa483386742805a3

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