Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ef3edf3c15f851…

MALICIOUS

PDF

76.3 KB Created: 2021-03-12 04:03:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 348b027c5410a9a42af2ca55f0863e1f SHA-1: 308c4f146778ad486547bc988f6ee54dbc9e070b SHA-256: f8ef3edf3c15f851f64927bb74fe0530a0458bd97f5bffe99b5f74124b4eba84
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, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'jottigo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily corrupted, suggests a lure related to learning English, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/award?keyword=manual+para+aprender+ingles+para+ni%25C3%25B1os+pdf PDF link annotation
    • http://sawedes.mywebcommunity.org/promised_land_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409621/normal_600544b4cab0f.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/nghQcc5/monster_high_venus_mcflytrap_dress_up.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/sikonutosenugesenadi.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/bhhhegx/tefilokugo.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/zabuladatovafofotivafu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484820/normal_5ff3e4a4470d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411694/normal_5ff0a30c9eaef.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/47932789780.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/2Mr7fhh/make_it_perfect_game_cheats.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465709/normal_5fdf892c4e01c.pdfIn PDF document text
    • http://foxilajat.sportsontheweb.net/sigodiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478951/normal_601d9785e140e.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/dozuga/business_appointment_letter_format_sample.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_c6cb4a6056f94605bcfbe6fca6f52b0d.pdf?index=trueIn PDF document text
    • http://gevejonitu.onlinewebshop.net/blueprint_to_mass.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/personajes_del_regreso_del_caballero_dela_armadura_oxidada.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_ee545217dc8940d393a627d393781469.pdf?index=trueIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_e8cca7efd62a4384a4f1d7d5cc6dc8c2.pdf?index=trueIn 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_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 5424 bytes
SHA-256: 8864f7182366795e0395c8be5f4da63552f9ffef02509887e91be9e00014f46a
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 11580 bytes
SHA-256: cff756b24a4cd6ce835bb3a0547ac015b1cd331ff3930951fe222b824c7ba9e6

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