Malicious PDF — malware analysis report

Static analysis result for SHA-256 039f8792ec962879…

MALICIOUS

PDF

77.7 KB Created: 2021-03-17 06:10:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3949a7facdf8041b0707a37365c846c2 SHA-1: c9c37fdbe203466521db7bc92b2e98e56285aff4 SHA-256: 039f8792ec962879f0030d236c3ece303756f29ffc3f4b6f433c9aa73b6b2eb9
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains heuristics indicating it is a phishing lure, specifically using an SEO redirector to facilitate a download. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the presence of external URIs and the overall nature of the heuristics point towards a phishing attack designed to trick users into downloading potentially malicious files, likely disguised as legitimate software or documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://nipisod.ru/wix?keyword=way+of+the+dogg+apk+obb PDF link annotation
    • http://blancop.xyz/revamw746v.pdfIn PDF document text
    • http://hocostyle.ru/88428606669fuzic.pdfIn PDF document text
    • http://xelonijabi.22web.org/47716652945.pdfIn PDF document text
    • http://pollsexpert.com/molidowozasowaxovijimonz6los.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_5fd7e2afad1c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392439/normal_60066d4ec00cf.pdfIn PDF document text
    • http://redpandarecycling.com/strikemaster_40v_ice_auger_for_salekem05.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/fjiSwjj/game_maker_studio_2_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_6012095ea488a.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/fiatlhj/sesisaxofawumujotaje.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/rizijubovapuk/android_lenovo_mobile_phones_under_8000.pdfIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_2876d4f1e2fc40109d855f53f26e05f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jovekus/sanyo_pro_xtrax_multiverse_projector_bulb.pdfIn PDF document text
    • http://bividit.rf.gd/46836580514.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/vafopepegivivisifuta.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/firestore_android_kotlin.pdfIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_8a591e300e424097af6cdb6a9e9be68d.pdf?index=trueIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_b795ffb49664426d89d7b34ad8dfe7b7.pdf?index=trueIn PDF document text
    • http://fodimezafizuver.epizy.com/information_about_bitdefender_antivirus_software.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_67283cd5b4d44564a9bb8743e3968bc8.pdf?index=trueIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_65fc316b6cea4712a0c9efa2fbbb7b1d.pdf?index=trueIn 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_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 5316 bytes
SHA-256: 07db96a7cd12a3659134b2541fec9611f11916d570b4f9a261a2fae55381d316
font_01_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 16580 bytes
SHA-256: a408c960a01a78f39386849c48f2ae9c210c76f84b3c478bd2288463477143fe

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