Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7344b9969b1163…

MALICIOUS

PDF

67.5 KB Created: 2020-12-21 22:58:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7dff13cf3a17de2d315de3147b8a5f3e SHA-1: eff9f779043fedd2ece23ee11ac8c1ebc9b7a30e SHA-256: cd7344b9969b1163b199e08d077fd77295cfedcb63466a551c9a8e91927fb47c
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of an external URI and the overall detection suggest a phishing attempt to redirect the user to a malicious site.

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://traffnew.ru/123?utm_term=7x7+powerpoint+rule PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497075/normal_5fbeac9ccdb5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_5fb32f131dcba.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/b446ebff-5642-45a4-bcbb-43cabc3c2f78/22077540545.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4d8d145a8629dca75fd8/1606372750291/air_pump_for_air_mattress_amazon.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf1a461e25426e1fe1078/1606283685195/77620488105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3e6059-6d55-4dbc-be9d-e87b1dc88388/52115545124.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6fe89778af068263bdf77/t/5fca944925df3404b63bebe4/1607111757150/virtual_race_car_engineer_2018_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/arithmetic_reasoning_study_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c3aad26ff1194f72fc70/t/5fc14514bc819f1cf406c503/1606501653778/27338329318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a46485-5fa6-4928-8d2e-062d9636f133/zotolafujititukodarage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e6afbee-4e47-4e74-ac6a-5d9cd93f9282/japujoroxonodisela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9246d044-91d4-44c3-8917-230cf85f0416/john_deere_la115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a69d48-29e7-400f-a7ef-6e4f2fec3b40/zujeluxagage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb3e629-8e1f-4bf3-9dd1-8a4643369e1b/kojemagukeme.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_off0000cfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD3 4568 bytes
SHA-256: 9921bdf71b3f30603d50afe9f3c2f63c56953d1825fc7f6c32dc75a0af919f6b
font_01_sfnt_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 10016 bytes
SHA-256: fecb644207d0a250db2d6e32dbf512ea81ec76b36c82c64adb62dd2e66140de3

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