Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd294869b95d7814…

MALICIOUS

PDF

72.8 KB Created: 2021-03-04 00:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b1b66bd904ac9e15cb199c6688f92078 SHA-1: ad52228d62b50994c000d22c91647af29b96dedc SHA-256: bd294869b95d7814d13d63b912b68d9758feea6e9513fdb4fbe5c222b6f91333
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic firings point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://soxebez.ru/strik?utm_term=vampire+diaries+season+8+last+episode PDF link annotation
    • https://buserakufazuwus.weebly.com/uploads/1/3/4/0/134097478/adf9829.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/ifSzyEI/zombie_farm_2_ios.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/2071b90.pdfIn PDF document text
    • https://wexigovepabenu.weebly.com/uploads/1/3/0/7/130738565/9054246.pdfIn PDF document text
    • http://bubuwem.iblogger.org/qsc_k12_specs.pdfIn PDF document text
    • http://kokusurajiguz.22web.org/wigavidapalekisogafegi.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/j6icge6/car_loan_amortization_calculator_with_extra_payments_excel.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/7771869.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/4fdfba637.pdfIn PDF document text
    • http://voxofixixaj.iblogger.org/cover_letter_resume_template_australia.pdfIn PDF document text
    • http://kmikaerfs.ru/samsung_galaxy_note_4_digitizer_replacementj4lnf.pdfIn PDF document text
    • https://nutagabe.weebly.com/uploads/1/3/5/3/135325028/kuronuxuvuke_wujuw_rinaduto_kolefadixenaror.pdfIn PDF document text
    • http://foyou.store/the_secret_audiobook_free_download_mp3_in_hindig06zq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufonokimilije.epizy.com/sidodol.pdfIn PDF document text
    • http://dowugodaka.epizy.com/mozivaduzupetumupuf.pdfIn PDF document text
    • http://kakapefetabol.rf.gd/latest_worship_song_nigeria.pdfIn PDF document text
    • http://nosaras.rf.gd/what_does_chinese_laundry_mean.pdfIn PDF document text
    • http://sisukedazigi.epizy.com/solo_guitar_playing.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_off0000e12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 5264 bytes
SHA-256: 79f0f60ff4e47d50aae9b3b07633c6c1594d94216899a85a3998c77ad76b30ef
font_01_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 10380 bytes
SHA-256: 1775466d11ae14993a0b2c7613f8480250bd748c2561b48950440fb26a48ab5f

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