Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de4aea4378d1134…

MALICIOUS

PDF

68.0 KB Created: 2021-05-09 18:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4bb895e366c2c240f4fa68949bdae1fc SHA-1: 5aaf63c48834b13623b10c0de69e7e07003be777 SHA-256: 8de4aea4378d1134684578853f99f5d368b541b5b3b4bbae7fd0b217d072b288
186 Risk Score

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 0.9996

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=dbq+14+the+industrial+revolution+responses+answer+key PDF link annotation
    • http://1cats.space/the_big_book_of_kombucha_epubc8jc6.pdfIn PDF document text
    • https://cdn.sqhk.co/madosodu/hb9Wibt/letasifexeneg.pdfIn PDF document text
    • https://pizijejubuga.weebly.com/uploads/1/3/4/8/134883891/lerofapaliveweluli.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/Rha69hb/colorbit_skull_coloring_pages_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/jeidijj/29439107398.pdfIn PDF document text
    • https://xebagaxasu.weebly.com/uploads/1/3/4/8/134878678/sudorirasat.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/jb6iehi/37810823280.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/eGLgcwP/box_office_collection_2020_class_of_83.pdfIn PDF document text
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/votupoturaxaka.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/sukodokagizowe-sugoxitexa-fufipekajat-rarefeler.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/oibImjd/troll_face_quest_video_games_2_level_11.pdfIn PDF document text
    • http://getcreditcheck.info/9794062658253cvl.pdfIn PDF document text
    • http://erogan24.website/how_much_is_a_second_hand_ds_lite_worthgbbyc.pdfIn PDF document text
    • http://sell-toclick.online/appareil_digestif_histologier9gqf.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/ejdCidS/flippy_knife_online_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/xorazasuno/hpIhbhd/best_pop_songs_2020_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/aHVhhiR/19629235381.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/CgcSgih/57006116029.pdfIn PDF document text
    • https://lajezufil.weebly.com/uploads/1/3/4/6/134636359/demukovuba.pdfIn PDF document text
    • https://popetebebulexu.weebly.com/uploads/1/3/4/3/134316921/2fccd7200.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/bTjevgj/guilty_gear_bridget_cosplay.pdfIn PDF document text
    • https://xisosisudotaju.weebly.com/uploads/1/3/0/7/130738948/fopulufaxorimop-vutavijajos-mevobigedotog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD01 5768 bytes
SHA-256: cb13ac12d8b90ae275fa1bcf8dca78afbda063b1878c69acf439beb3d83721be
font_01_sfnt_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 9772 bytes
SHA-256: 8c0f1570f2083d5e265a443eed2144ffa5fee98a184e7de7f2962a6bbd25c74e