Malicious PDF — malware analysis report

Static analysis result for SHA-256 256345075f512166…

MALICIOUS

PDF

68.6 KB Created: 2021-03-27 19:04:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8cb34ea115420260c81cc329899beaf1 SHA-1: 9710448e8654e707da6f4b5082763cedf1f4b63a SHA-256: 256345075f512166f4330cc89ce82eaed28e9a9ba9b4c16a7b84c131634030cb
126 Risk Score

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 0.9998

Heuristics 5

  • 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 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://midufefew.ru/123?utm_term=believer+lyrics+imagine+dragons+pdf PDF link annotation
    • https://cdn.sqhk.co/suxujaba/jeTbhjb/86265096618.pdfIn PDF document text
    • http://notevidesi.22web.org/mugunijasitexiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/rivojotewez/hCnigvX/gapeliwavatiditoludebu.pdfIn PDF document text
    • http://megenubi.22web.org/hunger_games_mockingjay_film_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/xikotoxerov/TjchdZE/stiletto_nails_black_ombre.pdfIn PDF document text
    • http://bogavevi.22web.org/3ds_emulator_free_for_windows_10.pdfIn PDF document text
    • http://gavokofubafixi.getenjoyment.net/ncert_books_class_11_and_12_chemistry.pdfIn PDF document text
    • https://cdn.sqhk.co/wimakebibane/jaRhde5/crazy_cee_lo_green_chords.pdfIn PDF document text
    • http://femabofagexabiv.iblogger.org/wamuvejesu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doledetaxezo.epizy.com/lashing_in_scouts_and_guides.pdfIn PDF document text
    • http://lugubukegi.epizy.com/54618951482.pdfIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_7e1c15ff7c284229aed8ae8341931bcc.pdf?index=trueIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_9a683a2b331f4afa84ef9ae0cb3947ac.pdf?index=trueIn PDF document text
    • http://fejusadifidexi.epizy.com/31994175440.pdfIn PDF document text
    • http://miduzusajaveg.rf.gd/enrique_iglesias_bailamos.pdfIn PDF document text
    • http://fogabifotu.rf.gd/reset_the_hs100_as_per_ug_qig.pdfIn PDF document text
    • http://tuxodubikanirod.atwebpages.com/gedazugaja.pdfIn PDF document text
    • http://vazefetapo.rf.gd/jusubofonulox.pdfIn PDF document text
    • http://nilidori.rf.gd/what_is_the_meaning_of_the_song_true_colors.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_off0000cfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE5 5688 bytes
SHA-256: d4c697ead088760a29c9ac1f8567401f4ab031cabc3141ad1bcfe36160d201cc
font_01_sfnt_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 9868 bytes
SHA-256: 12afa726407f57efcb9cb2456bc5b62df29c72ae16b33efa5b283caf6b9b340c