Malicious PDF — malware analysis report

Static analysis result for SHA-256 132f858d6f96daf9…

MALICIOUS

PDF

80.7 KB Created: 2021-03-08 23:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: af37f1ca14378a2b62c6c1d841903057 SHA-1: 1f06c444ee5af5f6850e2249a6452bb08a665a16 SHA-256: 132f858d6f96daf9b4f1719980ac9d321c08fa5327cb10009bcf909f6afe3432
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, appears to be part of this lure, directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://nipisod.ru/123?utm_term=android+vector+graphics+tutorial PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453105/normal_600fd2963b39d.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxamipuxum/sFhdcgg/mesomufinitev.pdfIn PDF document text
    • https://cdn.sqhk.co/dubezaxuviz/gfgihaI/wedajiwafopavefug.pdfIn PDF document text
    • http://bezprovodov.guru/hp_omen_15t_reviewx6a41.pdfIn PDF document text
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/1617903.pdfIn PDF document text
    • http://portkamesto.site/device_care_apk_downloadz331p.pdfIn PDF document text
    • https://zesajuletolif.weebly.com/uploads/1/3/0/9/130969916/ed5cd77121.pdfIn PDF document text
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/e219ee6.pdfIn PDF document text
    • https://tipidaxu.weebly.com/uploads/1/3/0/7/130739537/d686fc487.pdfIn PDF document text
    • http://easterthjg.com/855047377513xyae.pdfIn PDF document text
    • https://cdn.sqhk.co/sefibenip/gAiJrja/make_your_own_solar_system_model_kit.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/togabolafepogawel.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/mJgejhA/16157668530.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/1e0a905a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385228/normal_5fe4ceb403c87.pdfIn PDF document text
    • http://1ux.site/4624347285439cy2.pdfIn PDF document text
    • http://fezelegafefuv.mywebcommunity.org/vupununonewovusezu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385235/normal_5fcc9b654a875.pdfIn PDF document text
    • https://cdn.sqhk.co/kojogitu/cWifhb4/janulafutorusoso.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_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 5384 bytes
SHA-256: 909a1e09fbe89bb154f7d230c572e78821eaab52fa936459c1250e451d53fde3
font_01_sfnt_off00010bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 13328 bytes
SHA-256: 74fbe5f9d6851545f6595c869f02d1eefda1b701185dbc21685438884c292837

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