Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15d37687ac1af90…

MALICIOUS

PDF

89.0 KB Created: 2021-04-26 04:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c7c507fee624b8be503d3efc647f1d14 SHA-1: e1857eea32f3de7ed7df3daf56053f3f16ad0c38 SHA-256: b15d37687ac1af90cbfd6eaea476f1397c6c491bc69c1595356255a542824f73
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('botokaw.ru') that is likely used to host a phishing or malware payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests that the document is designed to direct users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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/strik?utm_term=vizio+e420i-a0+specs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486982/normal_5fd15a6c189b0.pdfIn PDF document text
    • http://ipai.online/466310519863hod8.pdfIn PDF document text
    • https://wilibupa.weebly.com/uploads/1/3/2/6/132681560/7137171.pdfIn PDF document text
    • https://sowofodifidem.weebly.com/uploads/1/3/1/8/131856479/biroz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415543/normal_5fdf72380e824.pdfIn PDF document text
    • http://hesap-al-sat.com/what_causes_a_squeaky_dryer2jbkf.pdfIn PDF document text
    • https://jasadugo.weebly.com/uploads/1/3/5/3/135341750/bomorufonokes_fekipuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_5fd8fe980e66b.pdfIn PDF document text
    • http://legko.travel/4460566817647cty.pdfIn PDF document text
    • http://imm-shoes2.club/lewiviledakemixvhv.pdfIn PDF document text
    • https://vinadesafabav.weebly.com/uploads/1/3/5/3/135305522/xutifume_jajapalojaraje_pukodigovu.pdfIn PDF document text
    • http://onlinetiser.website/73606377350wk39c.pdfIn PDF document text
    • http://hot-money.fun/teachers_corner_worksheet_maker48i1d.pdfIn PDF document text
    • http://vovality.club/boss_gt_1_dimensionsy1f2o.pdfIn PDF document text
    • http://kzrovk.xyz/16750342741azdcw.pdfIn PDF document text
    • http://momentshop.website/589462062590kxz5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_6056eece55094.pdfIn PDF document text
    • http://mists.space/hobart_handler_140_reconditionedcwusc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_80aa9b4bd1e14bc2981a587e343bd5ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/mawijasafunelitel.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/og_mandino_the_choice.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_d7db82762c254754bd6101b4f6db68c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekezaru/62044800611.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/que_quiere_decir_avaricia_segun_la_biblia.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 2960 bytes
SHA-256: 4253ce374f546ed82c0b962bfad5e193173c5af7311640f7068ccdda2cb38311
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 5208 bytes
SHA-256: 15880fbbbd79973d3c73659cbea87ace639e69e3127a6a19e33e9b32b7ae3e2c
font_02_sfnt_off000118b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 11804 bytes
SHA-256: 2f759d917955cc18b26e5474ee703f11be81adc34fb061bf73f76784b7df1f8f
font_03_sfnt_off0001409c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409C 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c