Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd830f9207e25330…

MALICIOUS

PDF

77.1 KB Created: 2021-03-31 20:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ebcf244e2c7cff890606d695b1101bb1 SHA-1: e86087faa86d52642f099ea2fad47e7b9dd9c7d9 SHA-256: dd830f9207e25330022fdd428a4ec9f3465e7ac6eec8889886c98939a4cdd326
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://dafemum.ru/strik?utm_term=chamberlain+hd900d+specs'. The document body, though heavily obfuscated, contains text fragments that, combined with the 'SE_URGENCY_LURE' heuristic, suggest a phishing attempt to trick the user into clicking the malicious URL. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://dafemum.ru/strik?utm_term=chamberlain+hd900d+specs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4486061/normal_60580281476ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423462/normal_60571eb707bee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424036/normal_6004be9e7425c.pdfIn PDF document text
    • http://hempmap.ru/manual_for_keurig_2.0_k250fp0bf.pdfIn PDF document text
    • http://muwilagugo.iblogger.org/kufezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412382/normal_5feaf878a37b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486975/normal_6037f427d8918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_6058c6f9cd42b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_601741378627b.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/xunojibudikevusudowod7tveg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/satudifin/jepaji.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/32500158881.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/kukigiz.pdfIn PDF document text
    • http://sibubixusa.epizy.com/85364186158.pdfIn PDF document text
    • http://velefaluzi.epizy.com/sowigagu.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/adjective_form_of_word_earth.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/do_i_have_to_report_my_childs_ssa-1099.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/rukewuxa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 5372 bytes
SHA-256: 91dc528097fd5211b70d3aede065e40e6239f743d620bed91ace19bf1e5ec9c7
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 11384 bytes
SHA-256: 397aea298a83fb739512cccb10fbb41cd7401d00f428a5b57902d8d143027479
font_02_sfnt_off0001180e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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