Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef3bfe10f596dde…

MALICIOUS

PDF

67.8 KB Created: 2020-12-26 20:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eddb87ca3da1e7646dbf62ae3eb8d008 SHA-1: 59d1b45f1c71200d6485c7e7903caf9a09f7b64a SHA-256: 3ef3bfe10f596dde8594be11a9cc787a1de6c073235b9b6c09f84962c2b2c008
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL that leads to a domain associated with malicious activity, likely serving as a lure for users interested in learning Romanian. The document body, though heavily obfuscated, suggests a deceptive intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://trafffi.ru/strik?utm_term=learn+romanian+language+free
    • https://cdn.sqhk.co/sejujona/EibYmgj/15008949623.pdf
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5f8bc1e5288ae.pdf
    • https://cdn-cms.f-static.net/uploads/4417653/normal_5fd84cfcad9f0.pdf
    • https://sijilosak.weebly.com/uploads/1/3/4/4/134476358/5215662.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/voxulija/firenawakiden.pdf
    • https://s3.amazonaws.com/vatosolikijike/mimil.pdf
    • https://uploads.strikinglycdn.com/files/030f0fc8-318f-49bb-8229-13cfcfb53dbd/deck_heroes_cheat_engine.pdf
    • https://s3.amazonaws.com/pesetufavo/xakadomofetetos.pdf
    • https://uploads.strikinglycdn.com/files/ac2ca77a-b92b-44de-bc96-2cfb90c26472/cwb_welding_symbols_chart.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d15b.bin
a542a3db9254af29fa5bfd52bfb86d4bf40089c44dfccaa588ce09f39f24b327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 4852 bytes
font_01_sfnt_off0000e1cd.bin
53d09bda52d5bbf2987a6f6e0adaaa6bbb346c28fa7c71407f9b67c988a30598		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 9568 bytes

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