Malicious PDF — malware analysis report

Static analysis result for SHA-256 38590f842e606d19…

MALICIOUS

PDF

75.0 KB Created: 2021-05-02 21:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0b17431c0d3da6d1562ae23b61dd9829 SHA-1: 6ffad9c7ad9b33226c940edeeb479c0873e6ed85 SHA-256: 38590f842e606d196f7e2a8c4e94a6440a84d34f7a9955a195826496342d6ff2
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/strik?utm_term=how+to+unlock+a+doro+handset PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386076/normal_6056423078f8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460463/normal_5ff53475e4a71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470985/normal_603e29283da96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_60571af98f892.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469145/normal_5ff957bd48516.pdfIn PDF document text
    • http://nijeratazuw.iblogger.org/lenojiwiwirenaluk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_606a48776f77f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/the_boys_comic_book.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/calculus_full_course.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_61088d95df8d40018fc451abdf8d48a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/1679651084.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/jelafenamimidufozetuwafop.pdfIn PDF document text
    • http://wabalegawamiraj.rf.gd/68391809003.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/what_is_the_meaning_of_hush_little_baby.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_34516a38752245c5901566b05cef668e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ragejufa/black_and_decker_lst136._best_cordless_weed_eater.pdfIn PDF document text
    • http://semiwexojexudu.epizy.com/xudolobabobexobijugided.pdfIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_8ad6b8decf7249efa61f24124b002d19.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_5b95dcb92f054a54b77ceebabf044448.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lebejos/stihl_ms310_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/creating_dashboard_reports_in_excel_2010.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/45237673999.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 5144 bytes
SHA-256: fc84fcffe16147168e500a0cc5e93203e7bf2ef096b3a5c8b428a4885a33ec4f
font_01_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 12184 bytes
SHA-256: 6811b250b4a026f8d35c2e60ba0f8e37ed48e8b966cada8fc43a853b5d532da8

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