Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5852608148f4dd8…

MALICIOUS

PDF

75.6 KB Created: 2021-03-16 04:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00f0323a7f012a310cbd294259080a95 SHA-1: b8e103d4a218e91005dd8ed0fa3568957383990f SHA-256: e5852608148f4dd82c661df967993cb2055640b4c907841fdab8517035557cab
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to a worksheet answer key, which serves as a lure to trick users into visiting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=section+5.1+weathering+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/safovokon/2gghhha/62269119112.pdfIn PDF document text
    • http://titanovyi-filtr.ru/educational_psychology_book_in_urduw915l.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/G4jjchj/zamobajoko.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/gGffjjQ/the_art_of_war_movie_2_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/hRhdKAx/wodunudabarireguf.pdfIn PDF document text
    • http://m-laskin.ru/ziwil13zi8.pdfIn PDF document text
    • http://znatural.space/nissan_skyline_gtr_r34_wallpaper_1080pirkz3.pdfIn PDF document text
    • http://atomyimperial.ru/170033229n7t9x.pdfIn PDF document text
    • https://cdn.sqhk.co/detateseb/ijigdhj/galaxy_attack_space_shooter_cheats_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/tisorobew/uBjj1az/berkadia_houston_multifamily_report.pdfIn PDF document text
    • https://cdn.sqhk.co/jusulikipe/ajikThi/ligijorosulalitejav.pdfIn PDF document text
    • http://ketousa.site/digamitasiyhlk9.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/ePja83O/neighborhood_credit_union_duncanville.pdfIn PDF document text
    • https://cdn.sqhk.co/kisilusotuke/PjjUfGN/the_wolf_chinese_drama_eng_sub_watch_online.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/rojalexipokadaz/292992186.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/wipunigefabojamudamiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ccbb073-84ce-424e-959a-f9c40410f6a2/georgia_driving_permit_laws.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a06e85-3b21-49a2-b32a-23dab12fc3a5/jeppesen_private_pilot_test_guide_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/answering_phone_calls_in_japanese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/827e3f37-c70d-4745-9819-d2d9bb6bdaea/lg_440g_unlock_gsmhosting.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/fb_login_page_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/shoprite_bursary_application_form_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53796f8-f385-4dcb-ade4-27712ba2af8e/xojow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7735d87e-6a72-4543-834a-d22727f6f39d/can_microsoft_office_be_installed_on_ipad_pro.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_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 5600 bytes
SHA-256: f1bd971669673962828476963bee90594ea6215d0e28751cf3c6468de0cf9753
font_01_sfnt_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 10824 bytes
SHA-256: c08fc811a2a82161ad69f9ad15a408a4650d8aa8e251aaca1794a1a829cdb706

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