Malicious PDF — malware analysis report

Static analysis result for SHA-256 532870f50a99b84e…

MALICIOUS

PDF

76.5 KB Created: 2021-02-03 16:46:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 52d670196db4357e81e64bdc3bfc60c6 SHA-1: 19c4f3861a25d5dd149733d6f40c748846607baa SHA-256: 532870f50a99b84e8d65992ecb40f27fe8850b0ac5475705eedd2a720d2d7d7b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malicious redirection attack, likely initiated via spearphishing.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/123?utm_term=daphnia+habit+and+habitat PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491398/normal_601835eb068c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406820/normal_5fca5da4022d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475000/normal_5ffc3663993b4.pdfIn PDF document text
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/2347358.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388416/normal_60031b9f30fc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374953/normal_5fcbdf1cec91e.pdfIn PDF document text
    • https://povazolanatul.weebly.com/uploads/1/3/0/7/130740072/paxux.pdfIn PDF document text
    • https://pejejuwefosewa.weebly.com/uploads/1/3/4/0/134040570/999869.pdfIn PDF document text
    • https://fukorolavo.weebly.com/uploads/1/3/4/6/134639224/9308565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_600a09f10f09c.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/pujilazobesutokawim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393036/normal_600441e1b0fca.pdfIn PDF document text
    • https://sapilijufidukuw.weebly.com/uploads/1/3/4/9/134901451/217ddb2903e6a5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424683/normal_5ff6a6bad1e1d.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/vidadaviwal/moxipajaxizu.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/lajuwit.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/ateten_gmlek_kitap_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/carrom_king_game_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_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 4880 bytes
SHA-256: 4b16ec7d38d0e2af794e9c3a34853e26233df19f97481bdf77d6c68f0c43a9e1
font_01_sfnt_off000100dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 10352 bytes
SHA-256: 0dd2b2940f377808c3edbc8d3c73ab687240e3ee0d6a9bb781a53b8ac740ef33

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