Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a2a5798a878e99…

MALICIOUS

PDF

69.3 KB Created: 2021-03-12 05:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c058db5a8d5eaf6d072cd8dc8923f7f7 SHA-1: a624fe081a58bc56f9a991875d00139ca48e47e6 SHA-256: f1a2a5798a878e99c62ee72d6a76d7f9a18faeea5d1d6a45c8b9358030f80355
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, forming a link farm designed to redirect users to other malicious PDFs. The document body, though heavily obfuscated, suggests a lure related to document conversion software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9465

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 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
  • 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://fokemale.ru/award?keyword=word+document+to+pdf+converter+software PDF link annotation
    • https://cdn.sqhk.co/nepajenine/cpfgfET/5004872169.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/hbNggyd/quiz_buzzer_app_free.pdfIn PDF document text
    • http://mybestchan.online/21858101810jopbk.pdfIn PDF document text
    • http://malespw.xyz/641668223170jbf7.pdfIn PDF document text
    • http://topsalon.xyz/24303385424ljh53.pdfIn PDF document text
    • http://talkme-news.info/12191051232383r5.pdfIn PDF document text
    • http://prostotit.site/92410921545jwx3e.pdfIn PDF document text
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/4848f525230.pdfIn PDF document text
    • http://yarrebitteh.online/fibapapikajobovaxanezifij3rvvq.pdfIn PDF document text
    • https://dusivasawomila.weebly.com/uploads/1/3/4/6/134660852/bojerutejuk-lupasotulawilet.pdfIn PDF document text
    • http://reawont.online/394357043964y8j4.pdfIn PDF document text
    • http://pshcomonhere.xyz/how_many_amps_does_a_milwaukee_charger_usep08d1.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/djei8Qr/kogusisefujo.pdfIn PDF document text
    • http://blablablacar.online/xesijokewubogojopabifowald60rt.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/p8jdwjj/44550233593.pdfIn PDF document text
    • https://rofokaragi.weebly.com/uploads/1/3/2/8/132815015/3400088.pdfIn PDF document text
    • http://zuvels.xyz/shotokan_karate_kata_listapldr.pdfIn PDF document text
    • https://konozobit.weebly.com/uploads/1/3/4/4/134456152/gomirosulu.pdfIn PDF document text
    • https://xopapukewude.weebly.com/uploads/1/3/1/4/131408664/f34d645643730.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_5a43b6d6f0de45fbbaec8d5a9fab895d.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_0fb22f0fa52d47a989932dbee28998e6.pdf?index=trueIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_0c9eb287f0234d858f226846e477a810.pdf?index=trueIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_e5039431b58f438cb4cad205c148c9c6.pdf?index=trueIn 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_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 5436 bytes
SHA-256: bf6b89ae17d037e25626d4acc21bc04e68cb480b0b16ea05b4c0d265e0b685d5
font_01_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 10580 bytes
SHA-256: a6f1cec5dc73a85ea9f61490cb88a042e529567a97f11b79736c40c959159021

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