Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de27ccd29e18c3d…

MALICIOUS

PDF

87.3 KB Created: 2021-01-08 09:18:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3e7fc1a18accd909dee55eee2527b8aa SHA-1: e23b76fcd359dcc067cb8db300a9c4171e9513de SHA-256: 8de27ccd29e18c3d7211879c6b87439cb2446d3d9987bccc4b5970d8cc2a6136
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely intended to trick the user into clicking it. The document body, though heavily obfuscated, suggests a lure related to an employee survey.

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=employee+culture+survey+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418383/normal_5fa2f74f1eb55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470016/normal_5fed4740228c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421764/normal_5fef351ec366d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484821/normal_5fbd09f9c7bdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_5f93e86c1399a.pdfIn PDF document text
    • https://cdn.sqhk.co/kufusivekogo/jdgjjcz/cross_road_blues_tab.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/1rjfiga/black_coffee_increase_weight.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375200/normal_5fddfaf8b4e5f.pdfIn PDF document text
    • https://cdn.sqhk.co/razanifuwuz/fieoEvg/81717360605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_5fb57c0dc33ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379731/normal_5fb73fc688f0b.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/5e89ce13-40ef-42d7-ba8c-12ab7fa07d58/run_race_3d_2_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/3994746541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7629ecd-b396-44e0-8410-a2fe15b43612/unmatched_air_traffic_control_2019._20_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/60321082966.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_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 5196 bytes
SHA-256: 6aa55d1d017750ceb77b29402cf9d8dcbfcf63c745aeedf9a882fcb3bf00239d
font_01_sfnt_off00012cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB6 10504 bytes
SHA-256: 5424258409724f4f5c936fb8ef0e86885fd0584b96ed2ab42b6686fe69b9bc20