Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc66d4341e19df5…

MALICIOUS

PDF

74.3 KB Created: 2021-03-29 22:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1fbd28ddaefe00129b504eb0d1ff0736 SHA-1: ed59e22aff8514551d606712695a75342d5891c2 SHA-256: 4dc66d4341e19df573c5a76c0c2aa10e19fcadd31675d301fa0354e4e3f6f771
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 hosting, indicating a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a keyword search, suggesting it's part of a campaign to drive traffic to malicious sites.

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://maypoin.ru/wix?keyword=metal+gear+solid+4+codec+ringtone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412889/normal_5fe992ca64412.pdfIn PDF document text
    • https://punoburewi.weebly.com/uploads/1/3/4/3/134305970/tamefuwazizijed-buzutov-wogenifiwekol.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/4464970.pdfIn PDF document text
    • http://reawont.online/iphone_6_notification_sound_mp3_downloadhakwk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_602d3fc4aba73.pdfIn PDF document text
    • http://shoplus.info/zugazosudodamonuwafokuhefjh.pdfIn PDF document text
    • https://cdn.sqhk.co/kezomerameki/dpQ5tln/fudunolirikobonawesil.pdfIn PDF document text
    • http://istlan.space/41533694238pmoso.pdfIn PDF document text
    • http://petrol-v-pol-price.site/o5xo1.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/hdjcvJL/20891253161.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/jgzifhV/turn_off_emergency_alerts_android_vivo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446166/normal_5fe5ae24cf61c.pdfIn PDF document text
    • http://fsbsiod.com/gogofodazhql1.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/xokofixedora.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/WNZkQii/fbi_open_up_meme_sound_button.pdfIn PDF document text
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/20cfd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465127/normal_60463d392d6d8.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_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 5200 bytes
SHA-256: ee008a142aad15426b6b17a1ceffb44c8850dc8e9fb36f5d663435bc4f70ed8b
font_01_sfnt_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 10792 bytes
SHA-256: c765aeff1462bea53fa60a24895d6c47775bed9ecd3ff8e6ee45e942bfb97aa2

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