Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3417477db1f8bae…

MALICIOUS

PDF

69.2 KB Created: 2021-02-10 04:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 01e1d78a63cb02fe53ee7f3a8e258757 SHA-1: ff2d69ed0a1fa3156d93c22f01c308be3f2cddce SHA-256: c3417477db1f8bae2cbfeb1933a6736f673abf6cd961260ffc229961cf36ab2c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as search results for 'caderno de caligrafia pdf para imprimir'. This is a common tactic for phishing or scam sites to attract traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/wb?keyword=caderno%20de%20caligrafia%20pdf%20para%20imprimir PDF link annotation
    • https://jazigibebegada.weebly.com/uploads/1/3/1/6/131606339/3709050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_600ced7181202.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/htjfuW0/solar_system_song_lyrics_cocomelon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_5fdc35f8b97d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481852/normal_5ffd4b87d2e51.pdfIn PDF document text
    • https://kunugamonigosa.weebly.com/uploads/1/3/1/8/131871761/16f61adfb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379722/normal_5fde05c86d1df.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/0hghggf/84464807383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_5fe7513a2780a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5fcae67995b86.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/whbhdoW/super_jack_s_world_free_run_games_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_5fd9626b7a296.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rajixubododafu.epizy.com/nj_driving_test_questions_and_answers_free.pdfIn PDF document text
    • http://reratosagozi.rf.gd/mepedunes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38F 5028 bytes
SHA-256: a3cd94dfa8410550b4d4c67bb18eec9abb397b636b8b23cfb26bfba1a477ef14
font_01_sfnt_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 12028 bytes
SHA-256: fc346be8123a71ef9459e04d23c577f412221d7375bac1b8311d9ad85e4131a6
font_02_sfnt_off0000f9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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