Malicious PDF — malware analysis report

Static analysis result for SHA-256 16610bf1808d5aee…

MALICIOUS

PDF

76.8 KB Created: 2020-12-31 18:29:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e88e49c5708d0efd67451754f674905d SHA-1: 89943de7ee24d6ef0ee2dda233be9860715a89d1 SHA-256: 16610bf1808d5aee4261ef7d13e172d8e89bd6e72f570b093b3f2c6ab65020cc
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a rulebook PDF. The presence of an external URI and the ML classifier's high confidence indicate a malicious intent to redirect users to a harmful 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://traffset.ru/123?utm_term=a+song+of+ice+and+fire+rpg+rulebook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5f8b304d7b268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476015/normal_5fd9383803a5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_5fa28886f186d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410431/normal_5fe89e35cc006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f9e15eb2174c.pdfIn PDF document text
    • https://cdn.sqhk.co/weralutofa/c7aqSja/faily_rocket_mod_apk_10._14.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/1764c8c1-9b3e-4d91-9a43-89879bffb320/sphinx_assassins_creed_odyssey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9420449f-86a9-4902-a556-5111123e4394/20880384729.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/dotonbori_shopping_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4236910-e1ea-4cb1-9e9a-4989533d2900/japimamil.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/manual_auto_archive_outlook_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/manish_kumar_jain.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/analog_communication_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/game_chicken_invaders_6_for_android.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_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 5316 bytes
SHA-256: 461d805ceda0c67863f922654aa67ee57ec4414782f999ea04c81d9a5bcab5be
font_01_sfnt_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 11012 bytes
SHA-256: 07092a49521d07989326a3de612c85ce44fe1bf48770f3560581859c925aeb13
font_02_sfnt_off000117ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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