Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63003481d71afac…

MALICIOUS

PDF

77.3 KB Created: 2021-03-14 21:33:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6e21410a57617cac671495100e1f5dd9 SHA-1: 108713a95d8cb59c140d8a85062e4892ae8b66fc SHA-256: d63003481d71afac0d31c062cff1747a7eac557e5b0708cd5fc98bc5de3f7414
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://fokemale.ru/award?keyword=measures+of+dispersion+skewness+and+kurtosis+pdf PDF link annotation
    • https://cdn.sqhk.co/wazikunal/fjfjfgi/72003198864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_6034560f38d16.pdfIn PDF document text
    • http://tosijamap.iblogger.org/wapojovuloxuvisonamiponib.pdfIn PDF document text
    • http://lejalabaku.22web.org/44788178997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425005/normal_60302f1ea09b1.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/hepifal/74258633644.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/c5WthiG/stickman_warriors_fight_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501206/normal_6045120778475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458625/normal_60114c0dc06c1.pdfIn PDF document text
    • http://naziniza.22web.org/whatsapp_for_nokia_206_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/ajdjiiN/dabaxetesaxerififabig.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/woberiz/ashes_cricket_2009_for_android_ppsspp.pdfIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_5f2d6708c9dd46b1adae4b0b3e926483.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogunabones/lajenuderebux.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/how_much_is_an_autocad_course.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/mokelodenopituralafi.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/lativunaxasoluwuwabenolak.pdfIn PDF document text
    • https://f270a619-8d23-4dc9-95fa-a4320df4b75e.filesusr.com/ugd/7bd364_acca3ec81105435a800a54f5449d917c.pdf?index=trueIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_8b746a148bcc4254ba882c7fa3f363de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/best_astronomy_app_android_2017.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_3789e659239c4fc09558abbaffc93c00.pdf?index=trueIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_9ff60562189a4180b150b74f02f1ee9e.pdf?index=trueIn PDF document text
    • http://noxanaviki.rf.gd/98436899769.pdfIn 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_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 5164 bytes
SHA-256: 77955288cdd5b7c324152b0511e221649f2bdb7e0c3791dee629ae9ba8f714f5
font_01_sfnt_off0001000c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 11724 bytes
SHA-256: c82923cff961d8b639e535630e5d9d84d0f5c972ac02d4aba3ddfb85c2d3fad0

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