Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b4d574043117f4…

MALICIOUS

PDF

75.6 KB Created: 2020-12-24 20:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f80d263f55e7fbb27f1bfa47e3642591 SHA-1: 16f6b6c96f87dbecf843c292027f610202819e62 SHA-256: 12b4d574043117f419582b94cec3ea24e7fa9b8bcaefe418e183a9f46731c3ad
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it is a phishing trojan. It contains an embedded URL pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The PDF structure and embedded content suggest an attempt to exploit user trust by offering free resources, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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?utm_term=school+website+templates+free++php PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f989b83c6601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448346/normal_5fb880376643f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407818/normal_5fc36c9f3815c.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/susopuzupure/porurofilirisa.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/diagnosis_of_typhoid_fever.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/free_operating_agreement_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/hydrothermal_energy_pros_and_cons.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/ravebileduwemi.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/bitcoin_faucet_free_btc_apk.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_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 5588 bytes
SHA-256: 88ac2637f509f8b68ed02abc506b93e61d19fd4c3d1d4118266c2f2fc67bd3c7
font_01_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 10416 bytes
SHA-256: c6639d3f7d2f253cdac674bf12d9e434dd2b78cb6edba5c71c9d6a7337691ae9

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