Malicious PDF — malware analysis report

Static analysis result for SHA-256 936d3a035096d484…

MALICIOUS

PDF

85.0 KB Created: 2021-03-28 02:18:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6f12e7945564ba958d3470e9d5c25012 SHA-1: 55db9a308f169e9c93e9716a2c796d451cf7412e SHA-256: 936d3a035096d4842b4e7b35cbea0efd490827e1d4c85582179aa1e95c826e0c
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 0.9996

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://pelibifir.ru/strik?utm_term=value+investing+from+graham+to+buffett+and+beyond+portugu%25C3%25AAs+pdf PDF link annotation
    • http://thelandofbadideas.com/is_2000_psi_good_for_a_pressure_washernigi0.pdfIn PDF document text
    • https://cdn.sqhk.co/bajafigotuvi/il8LYLH/robot_war_online_mod_apk_android_1.pdfIn PDF document text
    • http://counterman.ru/xebumanunuledunosusikokiwzl6cv.pdfIn PDF document text
    • http://honey-love.ru/vikings_football_score_today6exiy.pdfIn PDF document text
    • http://wupevijijoze.mygamesonline.org/wewax.pdfIn PDF document text
    • http://shmelev.pro/vedic_astrology_sign_datesh0tnt.pdfIn PDF document text
    • https://cdn.sqhk.co/rukeditele/hdjcJjh/96156874189.pdfIn PDF document text
    • https://cdn.sqhk.co/rivinodati/icaghh8/b._y._o._t._bryan_tx.pdfIn PDF document text
    • http://ranking-se.com/iso_10013_ultima_version1xw8m.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/jhngfha/funidagibisegipevevodas.pdfIn PDF document text
    • http://acgmgroup.ru/anlage_er_2018jwg5u.pdfIn PDF document text
    • https://cdn.sqhk.co/gidagolusi/gjjajfu/33217200780.pdfIn PDF document text
    • http://zanodopowe.sportsontheweb.net/cbse_syllabus_class_10_2020_all_subjects.pdfIn PDF document text
    • http://pedalini.club/418555341896hj3z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_a28fa51719b6498aba7b03d4acbff6ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db3fe07-6750-43c5-b4d2-1d12c1aa7138/hill_rom_bed_alarm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c768ae0-71c1-479e-bc38-1a45e202349b/62169699781.pdfIn PDF document text
    • https://bb0106b8-f3e0-414b-a873-a0e24df3f2ad.filesusr.com/ugd/b84a33_5767cb951a85473697b98d6134dcd34b.pdf?index=trueIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_c5568f938caa4898a569aa5da7262f62.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_f43617ce21d14678bd982c138f74b193.pdf?index=trueIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/under_the_volcano_steak_night.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 5752 bytes
SHA-256: 990262f50819dc1c4ceb61ad1ec49e743b3ff3c3527a1f5291ef92b4daa476ac
font_01_sfnt_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 11480 bytes
SHA-256: 69f10dbce8e79f1d55b93ddde8303f1fbe8f29c549433302044e1237ab30c4a0
font_02_sfnt_off00013567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13567 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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