Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c05331cf8e6a3c5…

MALICIOUS

PDF

79.2 KB Created: 2021-03-25 01:27:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fe8022e3ea687dd95be1a4625e5132fc SHA-1: 507a4fd985b0e19729ddda186d8fa88452d4efd2 SHA-256: 4c05331cf8e6a3c5dd9a1448d156d25607d3d71dea231e9bf7ea663bc5d8c94d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://baarspo.ru/wix?keyword=black+and+white+photography+a+basic+manual+third+revised+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471234/normal_6001d578065ff.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/ge_universal_remote_codes_for_vizio_tv_cl4.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/how_to_activate_gta_4_manually.pdfIn PDF document text
    • http://wiinorama.fun/dell_7010_sff_i5-3470_opiniewu7df.pdfIn PDF document text
    • http://lawexape.mygamesonline.org/nobotapawoz.pdfIn PDF document text
    • http://wobijamitiz.iblogger.org/56884694019.pdfIn PDF document text
    • http://nukogebi.22web.org/foduvafofibuda.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/xufekunajogovusibadepamip.pdfIn PDF document text
    • http://jitokinut.iblogger.org/is_ashes_to_ashes_on_netflix.pdfIn PDF document text
    • http://cleanup-sale.site/pakigabenolivomano1mmy8.pdfIn PDF document text
    • http://fosukejasalefep.22web.org/77791911087.pdfIn PDF document text
    • http://sunmarkt.ru/fl_studio_12_beat_tutorial_for_beginners04fdr.pdfIn PDF document text
    • http://gonalotuturopil.mywebcommunity.org/best_to_word_converter_online_i_love.pdfIn PDF document text
    • http://xusetifawog.mypressonline.com/xerawepozefimonepukup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368487/normal_5fe17c9a9a33d.pdfIn PDF document text
    • http://fesunasisodenod.getenjoyment.net/5679780975.pdfIn PDF document text
    • http://hellochildren.online/93146189604arnr2.pdfIn PDF document text
    • http://jotafitosixa.getenjoyment.net/50502388825.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xufizup.rf.gd/chalo_ishq_ladaaye_movie_full_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/70793845201.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/animation_splash_screen_android_github.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/66373033624.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_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 6076 bytes
SHA-256: 80891d7a8b38fad48958c47643a78a43ad2bc0a55aba71578a6e09c231574c31
font_01_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 10744 bytes
SHA-256: ed21d1eb7d5a758c77174e562e83a54d87b0230267e0bb2aa6b9746f0ff19192

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