Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff1b23b3852d186…

MALICIOUS

PDF

65.1 KB Created: 2020-12-25 19:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e530cd61a11df0e3b99ad7c1f4413c23 SHA-1: d6574e4df74d9460763ee2f7a7bd250506b34810 SHA-256: 3ff1b23b3852d186e8d5c8292ecd9153691ecd6e5b8a2f53273a8a2004119b1c
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1190 Exploit Public-Facing Application

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan. The presence of a callback phishing lure suggests an attempt to trick the user into contacting a fraudulent entity. The embedded URL points to a suspicious domain, likely used for further malicious activity or as part of the phishing lure.

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=alimentum+ready+to+feed+formula
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f979e3ac7802.pdf
    • https://static.s123-cdn-static.com/uploads/4390383/normal_5fc6cee13b4ee.pdf
    • https://cdn-cms.f-static.net/uploads/4445107/normal_5fb4393f5c618.pdf
    • https://cdn-cms.f-static.net/uploads/4391611/normal_5fdc6ae0dc16d.pdf
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5fbe7e2b013f3.pdf
    • https://cdn-cms.f-static.net/uploads/4459939/normal_5fa8d6278073a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4930badf-f1f0-4add-b371-b5de57c5d187/71806910905.pdf
    • https://s3.amazonaws.com/memexelu/arcelormittal_sa_annual_report_2017.pdf
    • https://uploads.strikinglycdn.com/files/d24b6565-3bd1-4e35-9d19-f7d50d1d8cc8/windows_failed_to_start_0xc00000d_usb.pdf
    • https://s3.amazonaws.com/jaxesabi/sizesuditexubafa.pdf
    • https://uploads.strikinglycdn.com/files/f75c0a16-88b5-41d1-8635-c91252c1f5fe/ww2_webquest_answers.pdf
    • https://uploads.strikinglycdn.com/files/e41ee8e3-890c-468e-91b1-a3d69e7ec776/juwaluset.pdf
    • https://s3.amazonaws.com/fosagobomap/disputing_errors_on_credit_report.pdf
    • https://s3.amazonaws.com/jolunenafobuw/acpi_ven_hpq_dev_0004_windows_8_driver.pdf
    • https://uploads.strikinglycdn.com/files/7c77c476-7873-4cc6-b502-5130b4158642/7879429616.pdf
    • https://uploads.strikinglycdn.com/files/bc39b20c-65ad-4384-8564-ba096c0ba7f3/91796138356.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c178.bin
46e32bad9ae8fb105f895afcc306d99d8dc968e330060a05a56d567652143153		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC178 4964 bytes
font_01_sfnt_off0000d24f.bin
f2519039e7e3ae7b1b05c70ef96b472f38da3f62fdcc6ab734c08d0b0e2d6d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD24F 10892 bytes

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