Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf37c1b5b241bdcb…

MALICIOUS

PDF

68.4 KB Created: 2021-02-15 11:02:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 76bcb923a1be9c1e3e9bac2840dce3ed SHA-1: a00979cd8d451bb12c567056cc0136f824ea38c8 SHA-256: bf37c1b5b241bdcb22988d36c306a5447a54f71769f3da4f90c2c52aa75865d7
124 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious content or download further payloads. The document body, though heavily obfuscated, suggests a lure related to 'Samsung vrt plus top load washer error codes', indicating a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

Heuristics 4

  • 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
  • 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://bologen.ru/strik?utm_term=samsung+vrt+plus+top+load+washer+error+codes PDF link annotation
    • http://bnl-jobs.com/fuverisanadetolalavanitusxy03.pdfIn PDF document text
    • http://wuzagabi.22web.org/reading_comprehension_worksheets_for_adults_esl.pdfIn PDF document text
    • http://rollernefrit.xyz/project_task_list_template_excel_free_downloadjn7w4.pdfIn PDF document text
    • https://cdn.sqhk.co/sokodajep/ibsx6o1/boom_beach_hack_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/manowipete/IZhegfs/motilalipabuwugomile.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/hfphchc/vejejixoterofulorewapak.pdfIn PDF document text
    • http://kutalevewomem.22web.org/62393269039.pdfIn PDF document text
    • http://yourcy.com/noun_verb_adjective_sortbass7.pdfIn PDF document text
    • http://baltika-trans.ru/56009263914mpcdt.pdfIn PDF document text
    • http://alteramaks.world/911156335420zvib.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/hgeigge/99088129718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408463/normal_5fe8a54555cc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_5fdac57d4a0a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446914/normal_5fe16b26789d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382965/normal_5ff2c6648551f.pdfIn PDF document text
    • http://stopnutristrike.ru/believer_song_remix_in_tamil1wtap.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/figLigL/events_that_happened_in_2020_october.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaxutere.rf.gd/gedosinikaruwategokuz.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 5744 bytes
SHA-256: a7b51539c418be99dd8f4ff0a91bc2fb360840da95aee2269a48f0755cd88391

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