Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ee4db97a793895…

MALICIOUS

PDF

66.4 KB Created: 2021-02-23 01:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ccaea9ab4e7d137b744a042eb7288653 SHA-1: 13696dbd1836383fe67f421a757aacba26fdba58 SHA-256: 35ee4db97a793895a600a769c890f0732bb14c63a77584703b1b80f044ef6476
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://jacksth.ru/123?utm_term=advanced+calculus+of+one+variable+lick+pdf PDF link annotation
    • http://sosutisokalelul.iblogger.org/latin_music_awards_2019_performances.pdfIn PDF document text
    • http://prodson.space/bapebuwuluzaqf2rn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_602576873ffe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_60151641bdc96.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/hioUjhi/ding_ding_squishy_bulk.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/cjihehf/sculpture_garden_mn.pdfIn PDF document text
    • http://blognews.top/66152521766t89xv.pdfIn PDF document text
    • http://santand-es.com/intel_sound_drivers_for_windows_7_ultimate_free_downloadrva7x.pdfIn PDF document text
    • https://savozajit.weebly.com/uploads/1/3/5/3/135320594/mimemedalevosuw_mejepijewifomi_vejasowuri.pdfIn PDF document text
    • https://cdn.sqhk.co/bugabowozi/bMajejj/wolf_appliance_repair_seattle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_60158878619df.pdfIn PDF document text
    • https://talovilivakalod.weebly.com/uploads/1/3/5/3/135326419/8470022.pdfIn PDF document text
    • https://togodinaxudare.weebly.com/uploads/1/3/1/6/131637070/06f542c6.pdfIn PDF document text
    • http://vas-rem.ru/mupasubipewilijabndsj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nezaxominif.epizy.com/tenozaduguposebowefasokug.pdfIn PDF document text
    • http://wisunomimat.epizy.com/yasin_sharif_tarjuma_ke_sath.pdfIn PDF document text
    • http://suxulumogu.rf.gd/thiruttu_movies_2018.pdfIn PDF document text
    • http://rufuregebedus.rf.gd/how_to_set_custom_actionbar_in_android.pdfIn PDF document text
    • http://risitikavaj.rf.gd/jusasapidimagenitofuguxad.pdfIn PDF document text
    • http://bajewilogofiro.epizy.com/acca_f8_bpp_revision_kit.pdfIn PDF document text
    • http://pidosowot.epizy.com/doodle_god_apk.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_off0000c5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D0 5400 bytes
SHA-256: 1f1adbf383c4a132dd88bc7f227cb76a2173dda1f774d517636007058d92dbe2
font_01_sfnt_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 10644 bytes
SHA-256: 70304c0b87490519ffc74453251edc36edd268dde105248d9a106385b1f9691e

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