Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab884e4e08268e5…

MALICIOUS

PDF

71.3 KB Created: 2020-11-10 17:01:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3a1d9c44c4aa39a01998a7880e531011 SHA-1: 3add352d4fa1ae51422d54cf9131b9d272e0becf SHA-256: 9ab884e4e08268e5803a051dea9f0fe9434b86d950a93c102e9411f669503ef3
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to 'stoichiometry test questions and answers pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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?keyword=stoichiometry+test+questions+and+answers+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fatisake/71672715316.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/mekawub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6fc8823-90df-46db-a146-53c85f0fd11a/waduv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0adc5f78-9d62-404e-857b-57e2151a7005/vifigodaxumovibuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/bridgestone_hoa_cedar_hills_utah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c5d464-126e-4394-b515-4fefad4a8700/siladujaladi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c3ed63b-a37d-4e33-94b3-9bd87b48015a/a_small_cart_is_rolling_down_an_inclined_ramp.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/maternity_leave_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b61b689-c421-481a-b8b0-9bc0201a7820/80979504146.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/53181449436.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/17318547456.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/5097731997.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/asme_bpvc_section_viii_division_1.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_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 5788 bytes
SHA-256: 0c1bf58e3884b6fe1c0f443a6b535acb508adba7c13d4ce957e9dee4555c7eb1
font_01_sfnt_off0000ec10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 10440 bytes
SHA-256: dc12c65400c847f8a8925da8793339879d0cb8aa21075f74de4bbbd319919d7f