Malicious PDF — malware analysis report

Static analysis result for SHA-256 40680fb0287bf2de…

MALICIOUS

PDF

77.0 KB Created: 2021-02-20 10:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6ed2fcebd9c68f40175bba7ff2652fb1 SHA-1: 5f693f4a443fedcaf679aa057026be4824ea5ff7 SHA-256: 40680fb0287bf2de905ae60144de226ae761e98832c676a2e5e2f6c7547074fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to host malicious content or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports the phishing pretext.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/123?utm_term=hp+deskjet+ink+advantage+2546+driver PDF link annotation
    • http://lorenbayi.com/kingdom_come_deliverance_belladonna_locations0ioeb.pdfIn PDF document text
    • https://cdn.sqhk.co/tolebilu/a6Tibij/toilet_running_fix_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/jjjaidK/18206078072.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/fXkieU1/pifawagopabuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_600fe3977beaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5fe8823488ca6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469358/normal_5feee03c40ebf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445321/normal_5fc8b101a017d.pdfIn PDF document text
    • http://useplafond.xyz/9879114522709cr4.pdfIn PDF document text
    • http://zathkatow.xyz/ejercicios_isomtricos_e_isotnicos6ap90.pdfIn PDF document text
    • http://registrat.space/yo_call_blocker_pro_apknllb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478685/normal_6008e064a51cc.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/likukutetu08rsp.pdfIn PDF document text
    • https://cdn.sqhk.co/poxofufiko/f37dhiq/alaska_wallpaper_iphone_x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402501/normal_5feb780af1270.pdfIn PDF document text
    • http://afracheat6.xyz/totavoxulajewajegom5noqr.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/ciiRje3/14659432914.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 5432 bytes
SHA-256: 230e9834c149faabe5e4f70f0f647ce4c0c666f00ee69790256b36f42ff3e2f6
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 10812 bytes
SHA-256: aba28d0d561007952dff1fd25444ccab2f2d175596a1d30f1054addb0779c89a
font_02_sfnt_off000118da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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