Malicious PDF — malware analysis report

Static analysis result for SHA-256 2175d846a16152f4…

MALICIOUS

PDF

71.6 KB Created: 2021-02-28 20:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3b8c1e714de6347c5fb146587f4d6489 SHA-1: 3ac483893ddf0ae9487566847eadbd4d566dcc09 SHA-256: 2175d846a16152f43786c66258c0e2644d3d3e05332d7e02eda05ebf68ae8cbe
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 and link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to testing golf cart battery chargers, likely a lure to disguise the malicious intent.

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://seumenha.ru/strik?utm_term=how+to+test+a+golf+cart+battery+charger PDF link annotation
    • http://50offshop.pro/becker_s_muscular_dystrophy_treatment_guidelines1mm9z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412396/normal_5fc74ad4ce2e5.pdfIn PDF document text
    • http://dreamingdeveloper.com/71693829645kzch2.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/f8mG2ji/protonvpn_free_vpn_secure_unlimited_apk.pdfIn PDF document text
    • https://semitedajun.weebly.com/uploads/1/3/1/6/131636975/mogeva.pdfIn PDF document text
    • http://buzixivolerat.22web.org/24255561561.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/jgh2geJ/costume_store_nyc_midtown.pdfIn PDF document text
    • https://xikunozazoteta.weebly.com/uploads/1/3/1/4/131453294/disaxeri.pdfIn PDF document text
    • http://erogan-columbia.site/historia_de_la_literatura_universal_martin_de_riquer7mv5j.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/ifGjdie/today_s_date_public_holiday.pdfIn PDF document text
    • http://swiss-gear-top.xyz/dell_poweredge_r710_server_datasheetxwpmb.pdfIn PDF document text
    • http://ampinternational.org/planet_fitness_contract_freeolce8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456128/normal_60381f2960443.pdfIn PDF document text
    • http://momsmall.space/namabobenuknx9g.pdfIn PDF document text
    • http://prolac.ru/independencia_de_sudan_del_surqjlin.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_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 5436 bytes
SHA-256: 3abd60073cca1f170a972ea526bb046cba60451adb70ededcb0f736b6dcc25fa
font_01_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 10488 bytes
SHA-256: 04a11240395ae66071ea69eee060160a7aad061c50eff37b6051e5b8bfe4b766

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