Malicious PDF — malware analysis report

Static analysis result for SHA-256 82525bb6db91e9e8…

MALICIOUS

PDF

65.9 KB Created: 2021-01-06 12:28:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c6db5e1c6d691b319ad58fa36340741d SHA-1: 83b50fb1dd906974e49cc4d87d89c53646249927 SHA-256: 82525bb6db91e9e80fbe68fa46d02864129594814aec9758b50d2cb14f2fcf3c
96 Risk Score

Malware Insights

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

The file is identified as malicious by a ML classifier and ClamAV, and contains an embedded URL that appears to be part of a phishing lure. The document body, though heavily obfuscated, suggests it is masquerading as an answer key. The presence of embedded URLs and the overall detection suggest it is designed to trick users into downloading further malicious content, likely through a phishing pretext.

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://trafficel.ru/aws?utm_term=csat+paper+2+2018+answer+key PDF link annotation
    • https://cdn.sqhk.co/lilapanorup/yihifzB/flippy_bottle_extreme.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/0hihibE/most_popular_ringtones_of_all_time_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490724/normal_5fdb259bf1e27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_5f8b5a6e26608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446634/normal_5fa4f2fcbc3c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_5f92f4288f0b7.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/791c6fdc-9bfb-4ee3-ae38-d9fbe7a4c272/19503900290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ee1d1f-f6df-4808-a208-c88ce7eb389e/iphone_5s_ios_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caaf520e-40f5-4b7d-9860-0dc0f9d39749/5209079187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fabdff19-b56c-45d4-97e1-53cba24d3317/trials_in_tainted_space_goo_transformation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f00ea9e-643d-47db-a5cd-10c0efc42844/angle_of_depression_formula.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/dukunanoxino.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/71371097058.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_off0000c48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48D 5464 bytes
SHA-256: f2ee3d6d2c200a1b45e8e689ea024b64a60e3062b932d7390119174c3c29aefb
font_01_sfnt_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 10432 bytes
SHA-256: e7a1aae1f737c0def09576bc04e8beddee99ffef4d377312b962fb9e70961fe6