Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef1351ebe523d12…

MALICIOUS

PDF

67.5 KB Created: 2020-12-17 01:35:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 33282caaec568fb883e8eb5e4a758bcc SHA-1: 2d34154bd1600b18a47e7abc1aa80f115246a087 SHA-256: 9ef1351ebe523d1288053ca00feef66b64333af8091a31a6849ae2c65d5ff5ec
104 Risk Score

Malware Insights

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

The sample is identified as malicious by a ML classifier and ClamAV, with the latter detecting it as a phishing trojan. The document body, though heavily obfuscated, contains elements suggesting a lure related to employee discipline and a deadline, indicated by the 'SE_URGENCY_LURE' heuristic. An external URI pointing to 'trafftec.ru' was extracted, likely serving as the malicious payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=employee+discipline+policy+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5fc0155aa50f9.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/84fb2a82b089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418175/normal_5fbaaeac8fb43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411250/normal_5fb50f0ae8c07.pdfIn PDF document text
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/c9e6f2.pdfIn PDF document text
    • https://mexavabawidusa.weebly.com/uploads/1/3/4/3/134375000/mesesedofavipujitor.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/zaxajib.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/wewolivegidefapakox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494140/normal_5fad5be5f0be7.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/e87cf01b-ea39-4177-9b03-46cbc79f9c7c/southern_cricket_frogs_interesting_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b70cad1-34e1-4014-9a9c-3d5d240fbb83/oreck_handheld_vacuum_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba44047-ea3e-49bf-8387-ff02e677ea35/44898786117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b902360b-07b7-4250-b7d6-87e23a9aaeba/merry_christmas_nativity_images_gif.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_off0000cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 5184 bytes
SHA-256: f09f7fd0b917a2419be52c256cd5ad0f3f6d81880f5b09451d1cc80c32d320ca
font_01_sfnt_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 9932 bytes
SHA-256: dd7746ecd16601ad7b6c6d84fc8e72fac54b9350c0eec91c5321c311a821952d

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