Malicious PDF — malware analysis report

Static analysis result for SHA-256 343295b8aba0a038…

MALICIOUS

PDF

86.3 KB Created: 2021-05-13 06:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2abb0253b97ba545a8d735b5c2ecfe7d SHA-1: e20da7f3294db6e1be7cd89c5c4cafef03c4b7e5 SHA-256: 343295b8aba0a03892fc66e1780b786f9cabec66a2a84c714b54e738ee41078a
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('botokaw.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=ikea+hemnes+daybed+frame+with+3+drawers+assembly
    • http://steblin.pro/advanced_buteyko_breathing_exercises_downloadlkvyt.pdf
    • https://cdn-cms.f-static.net/uploads/4411717/normal_6025471a860c8.pdf
    • http://cabinetsly.xyz/the_periodic_table_songe1dyh.pdf
    • http://laribij.scienceontheweb.net/totojebuzarabiw.pdf
    • https://cdn-cms.f-static.net/uploads/4370555/normal_604bbc4b2fb5b.pdf
    • https://cdn-cms.f-static.net/uploads/4365600/normal_603be65ad852f.pdf
    • http://xerudipebij.22web.org/memarukipuzuma.pdf
    • http://ruszaimclub.ru/tafseer_ibn_kaseer_with_english_translationomvp0.pdf
    • http://jabewes.medianewsonline.com/64249297.pdf
    • https://cdn-cms.f-static.net/uploads/4390055/normal_60218928c5a92.pdf
    • http://ejinaya.com/what_does_it_mean_to_have_self_knowledgeiaa7u.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_16f8f8ce8c564d2e9b50e02153227d08.pdf?index=true
    • http://nupabekasowijem.epizy.com/probiotics_and_prebiotics_in_pediatrics.pdf
    • http://libuninudavek.rf.gd/deming_wheel_diagram_template_for_powerpoint.pdf
    • http://kapirexazi.onlinewebshop.net/prefixes_and_suffixes_activities.pdf
    • http://sibugisijan.epizy.com/fuzomisakoxaminulugo.pdf
    • http://gonurorirezode.epizy.com/6862343264.pdf
    • https://b2691e05-be35-46d2-a26d-08c503de0475.filesusr.com/ugd/b15c0b_8f80a23606684d3886a90fb442f239a2.pdf?index=true
    • http://namakanexir.atwebpages.com/65134821369.pdf
    • http://tujijekaxevon.rf.gd/sujipowekemurobunopesuk.pdf
    • http://repefewuvu.epizy.com/delonghi_dedica_espresso_machine_manual.pdf
    • http://roxifopovarag.rf.gd/81475377323.pdf
    • http://saninov.epizy.com/wamegisigibekegovi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001100d.bin
667b91e725425f7732c0c8dd81531868d91266a41c281327f92316ac6d69a3ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 5644 bytes
font_01_sfnt_off00012333.bin
5da97fdb7836827e27058fd1727277821b478988dc1199eb5f3be793cdd72dcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 11848 bytes

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