Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c48077188dec57…

MALICIOUS

PDF

82.5 KB Created: 2021-03-31 16:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 99945b710c9fc788780391ab5e550aed SHA-1: baa1c9b29fd84cd2bba48bad7cf26b16cbd768dc SHA-256: 13c48077188dec57cefa911f3b1130a3c69df9314ec1dff878920f785ef30a59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a significant heuristic indicating it's a link farm on disposable hosting. The primary malicious URL identified is hosted on 'botokaw.ru', suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/123?utm_term=parquet+file+format+data+types PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408718/normal_6052b5a5b5bc8.pdfIn PDF document text
    • http://merikasavotenum.iblogger.org/15388682038.pdfIn PDF document text
    • http://wojidibotetim.22web.org/nunziata_cemento_armato.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/G4ifidu/46863832901.pdfIn PDF document text
    • http://jidugisukeranav.iblogger.org/3894520106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_602af5941ce3b.pdfIn PDF document text
    • http://izzzaaa.space/531157704668epzh.pdfIn PDF document text
    • http://zesamoa.online/tatetenutaloraduxekadabhd7t.pdfIn PDF document text
    • http://kepumomojixuwog.iblogger.org/nolesigaxuful.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453335/normal_604966af7f468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420013/normal_601aac942c6ab.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazekerubu/eBHieJb/15682422311.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maxisoluxutur.epizy.com/10344875444.pdfIn PDF document text
    • http://janenukexozi.epizy.com/exide_battery_price_list_2020.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_16f5919cae46402183f502318199ea97.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_ebbce8ef3ff448889bdcb8bdbd516fba.pdf?index=trueIn PDF document text
    • http://felubumasosazi.epizy.com/geographical_information_systems_in_archaeology.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_3ec53404de8f415e86e3c8e01cd71166.pdf?index=trueIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_9f83973e328a4d95a40f125f27278644.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_9e3a518e76ab40f881b7cc7d8f21df2f.pdf?index=trueIn PDF document text
    • http://tuvajitivozozek.rf.gd/series_of_unfortunate_events_books_ranked.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 5416 bytes
SHA-256: efd7e10b801eccda0b6abc16fa59f086b73ee098a8d797755c6fdf9e2bfc9ebe
font_01_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 12576 bytes
SHA-256: 0efdaea02b4240d4ff37d04208e094f789b07bb92b262964c9a60f2430c0655b
font_02_sfnt_off000125f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F0 16120 bytes
SHA-256: 751f92ef85291b1701ea3386043310f9c552f4ef870028616695039d5d7a39ff