Malicious PDF — malware analysis report

Static analysis result for SHA-256 70274919c654daa1…

MALICIOUS

PDF

84.5 KB Created: 2020-11-20 19:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 06ac3763d97915f3b23ef112f6d9085a SHA-1: 1f1897e530e72f79910c8a13ed088a8087de5652 SHA-256: 70274919c654daa1e7e200d9f27dca3fa17d6b8dd91ea1f5c88267e3e50998a7
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that leads to a domain associated with malicious activity, likely to deliver a secondary payload or phish for credentials. The document body, though heavily obfuscated, suggests a lure related to educational content.

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://trafftec.ru/aws?utm_term=integers+worksheet+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459479/normal_5fa1e192a208b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451230/normal_5fb43a86b7687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_5f8ab07273d37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f8b48a597b3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_5f9f0359e6910.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/luropi/crock_pot_manual_slow_cooker.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/56636301615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b28fc4d-0194-4715-8ad1-2583cce00393/jisevovuzilowisejul.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/degigugesipux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2967c84-7028-479e-b8dd-72b646cf756f/tosekuvesu.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/21059082715.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/linear_equation_worksheet_answers.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_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 2828 bytes
SHA-256: 85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
font_01_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 5008 bytes
SHA-256: 16458f33083b856ffeaeff2643a92311f75f0ea467883773e0ae531dfbeff4c3
font_02_sfnt_off00012106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12106 9932 bytes
SHA-256: 833fe838267bc9de5813cac5b488bc7317d3771b25718c92bb3efdc6dbe87c74