Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42d7694f22981a5…

MALICIOUS

PDF

87.6 KB Created: 2021-01-06 19:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7b307b38382575eda6655e8fec9f8f31 SHA-1: fe88f65cfb3389ae770457e0f6c8d64989426808 SHA-256: b42d7694f22981a53681cdf4d49e955fd3e01dbee30a2754990e967b27a1eded
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains a URL that is likely used to deliver a malicious payload or redirect the user to a phishing site. The presence of embedded URLs and the overall detection by security tools strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/aws?utm_term=interesting+powerpoint+templates+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410431/normal_5fa8440d21cd8.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/hahwzhj/28997821557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443608/normal_5fb38fc0901bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_5fa581e77b397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_5fbdc11e8d68a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375196/normal_5fc3df545f8fc.pdfIn PDF document text
    • https://cdn.sqhk.co/zatufora/Bjdqjbi/ritagumedepomoliv.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/axjjqji/26689172821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_5fe70746e34b7.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://uploads.strikinglycdn.com/files/d28132b8-dcbb-4356-b81e-9e8ccd483a22/39308269083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b577c30-65f1-47b4-9227-ac792d0db75f/child_actor_who_played_little_ricky_on_i_love_lucy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd32458b-828b-4ca9-a346-32de14ecba54/notidajetobabevogesuxajit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e41e7505-2101-49fe-8c5e-86c4b36d174a/20332014569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396e58bb-382e-412e-8d92-e8174fc1e20c/gajigavib.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_off00010d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 5036 bytes
SHA-256: 857c42d7573773a062c7281efa372ac40458edd7815e0d1189615ed230e2eb43
font_01_sfnt_off00011e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E75 10724 bytes
SHA-256: e2438ee7d05ba8dc05c2d468a53da2a1ee26db3a8cc166d1e29dd14f70f5345f
font_02_sfnt_off000142e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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