Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9b9259e439116e…

MALICIOUS

PDF

69.1 KB Created: 2021-01-06 01:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 02d0a9aba19ff2014213efba292c0a08 SHA-1: ecbfcf16c845bb85c0a7676eb5b254e75b57e9bb SHA-256: 5b9b9259e439116e1789ba60dd5a592f7554f1c5d6a2454fa613ba12bf7249d4
96 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains an embedded URI pointing to a suspicious domain, likely intended for phishing. The document body, though heavily obfuscated, suggests a lure related to 'translations math exercises', further supporting the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=translations+math+exercises PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386848/normal_5f8f926a34bb0.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/jh6kFhi/trench_war_definition_ww1.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/gjenXih/83568728696.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/gtje4ie/vujedivatavuxopuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/romoridejefexovixajav.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/81835733685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9aedab-ed41-4607-a214-86a5ac9b548c/wibopinototezufulebogerev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946493b5-d4d1-4e6f-b62b-fda220260750/new_gmail_phishing_page_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e2929d0-33bb-4c01-8955-5c606d5fac47/93576565153.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/altair_inspire_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/chock-_full_synonym_formal.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/diwum.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/bitumen_sheet_supplier_in_singapore.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/80437875577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a813975-ac90-4e37-a04b-30205d86ba0d/21099098593.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_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 5056 bytes
SHA-256: c541384ecdfc799b2b0e9cfe9b31e5877ec86905ad272b6b808dcb39a6c9beb3
font_01_sfnt_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 10636 bytes
SHA-256: 5da2b94aeb34e1024a7a514d9d184e1e24839ce9db5dec919626b2d900c03915