Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9f09074ab7f0ed…

MALICIOUS

PDF

59.1 KB Created: 2020-11-11 06:10:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 81f8ffa5187a8a4599a0591b1fbdbcef SHA-1: e4eeea0b95cab36aef42653f8b69b2fd102fefa4 SHA-256: 7c9f09074ab7f0ed2114988d3300113e6705bcc6d5077ae11e2aad107d500413
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by a machine learning classifier and ClamAV, with a high risk score. It contains an embedded URI pointing to 'traffset.ru', which is likely used for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'magnetism physics worksheet answers', indicating a social engineering tactic to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/aws?keyword=magnetism+physics+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413108/normal_5fa716a6205bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f8eff5933b75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407069/normal_5f9f665b8e97e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5f98bac93c8f3.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/3f321b36-7284-4269-a7df-474504ccb61f/vexeporasepa.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/tadan.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/latest_boy_baby_names_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/the_norton_field_guide_to_writing_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12d1797a-69da-43a7-90d3-dddc74014b0a/korevebogikete.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/market_leader_business_english_accounting_and_finance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8cada05-1214-44d8-9231-1d142d64d4ba/82941951860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf591fc1-089c-4abe-9361-dc8124675846/76457968188.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/calendario_noviembre_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f223bf29-f31b-4842-963d-48c5362f1859/zinumikatusijoraredibuz.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_off0000af4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4C 5576 bytes
SHA-256: 16e96f5ed429b7e754eefb02183e9ecb1be8bd368f3c42eb8361b091baf39628
font_01_sfnt_off0000c245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC245 8516 bytes
SHA-256: 9854aba1c81df7c85233d70c293bf954358c56c48993457d810bc2e6e7aea3ff

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