Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a7f864c340aabe…

MALICIOUS

PDF

71.2 KB Created: 2020-11-14 15:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 48316f773b26ac208680b63c6c7c30eb SHA-1: 1d74cb43cbad703032bb89d7f0b82d080673b8b0 SHA-256: 82a7f864c340aabebf623cee95f6f0fcafb72a17f02c253913d9aa5af28498c2
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'data levels of measurement worksheet'. The embedded URL points to a suspicious domain, likely serving as a phishing or malware distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafficel.ru/123?utm_term=data+levels+of+measurement+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f9062494e3e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5fad9bee7b19f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c46a67-7cdf-41f6-9557-dd78548f6a23/mumesowadarukiruwip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c555a0-3759-4ef1-b167-98458469b013/organizational_behavior_fourth_editi.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/rush_hour_karting_waiver.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/emerson_nature_full_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a555d017-08fc-4921-ad06-a5a33e558ea2/clackamas_high_school_alumni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab6d0139-c11d-4935-afa4-4af3906f4932/zefagafirojozokoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b63ab32-009e-4696-84fe-53229d5ca73a/tixufejagexoripijolizav.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/hssc_declaration_form_annexure_e1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e5cfd5-e4b4-453c-b0fc-1de91a39ce7a/86576233723.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/wexezoferifexezakupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd8088a-9356-4bc5-ab6e-2bcff25e04e1/362832618.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_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 5224 bytes
SHA-256: 1f095ee392bc58c3ae5a6708ae9f51c6181342fb68a3f3a3a2ba063900d44331
font_01_sfnt_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 10732 bytes
SHA-256: 4a7ea0558240dd34a3763827e8da27476e04112722f56580d01f7c7fcaab59e7