Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a6f0f44b218ae8…

MALICIOUS

PDF

71.7 KB Created: 2021-03-28 10:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bcfc94b6f46c5be65fce9a90a0b834bd SHA-1: 3c81b68431eacd12f34bb02434e08d961ea5cbf9 SHA-256: 83a6f0f44b218ae8d9e351104586cabdb09a673ee9e8609250c8549060a4b540
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The numerous external URLs, many hosted on disposable domains, point to a link farm or phishing operation designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/123?utm_term=super+mario+bros+2+theme+sheet+music PDF link annotation
    • http://dressnbuy.com/more_piya_video_songx4sm6.pdfIn PDF document text
    • http://resapus.scienceontheweb.net/convert_file_to_word_2020_online_free.pdfIn PDF document text
    • http://wide-mean.top/buwekogqnge4.pdfIn PDF document text
    • https://xisilejawot.weebly.com/uploads/1/3/4/0/134016881/bimonudi-bodazokef-xutonipinod.pdfIn PDF document text
    • http://pixell.store/panasonic_plasma_tv_red_light_blinking_11_timesnfri0.pdfIn PDF document text
    • http://jadebey-x.com/commuters_sans_extra_bold_free_downloadob2bx.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/samenovidurimidufada.pdfIn PDF document text
    • https://wigawiwamenusum.weebly.com/uploads/1/3/5/3/135323889/faresi-wegafikime-dasabuburexede-pomiger.pdfIn PDF document text
    • http://filemarker.store/pbs_les_miserables_concert_2019z8feu.pdfIn PDF document text
    • https://xetizokabonon.weebly.com/uploads/1/3/2/6/132696323/2967180.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/62239329913.pdfIn PDF document text
    • http://instapriz365.online/dr_zhivago_book_reportqkjxb.pdfIn PDF document text
    • http://afterdealer.pro/700640807306bkq8.pdfIn PDF document text
    • https://jezexubuxerib.weebly.com/uploads/1/3/4/0/134040893/xesutezozeja.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/7427759.pdfIn PDF document text
    • https://nukanepinax.weebly.com/uploads/1/3/1/4/131454046/168defcfa.pdfIn PDF document text
    • https://tajifajedu.weebly.com/uploads/1/3/1/6/131637014/4370682.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/compress_size_mac.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/jixeremipet/ftse_china_a50_index_factsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/34520501812.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/amar_chitra_katha_books_india.pdfIn PDF document text
    • http://torejejowomu.myartsonline.com/lonely_planet_japan_2021.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_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 5516 bytes
SHA-256: 286f5e8c664fd5e8edebbc742e23dec84b524db0a41cc37eaccf7d2039849445
font_01_sfnt_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 10608 bytes
SHA-256: 7d39dbc4548528ddc8bc5d1b3cdcc3ad5827eb7559ab4a0c6e0348fcec832f52

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