Malicious PDF — malware analysis report

Static analysis result for SHA-256 991266b97cee03ab…

MALICIOUS

PDF

73.4 KB Created: 2021-01-21 19:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: cd92302affb8a300ba20c92c8c02f4be SHA-1: db49c5bd73791e5de8438f5a259d71682f5cee98 SHA-256: 991266b97cee03abc960cacece386a87f6dc30b6a6a15256f029c47a558121ab
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL pointing to 'traffnew.ru', which is likely used to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a guide.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/aws?utm_term=homebrew+3ds+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444378/normal_5fc66435238a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373776/normal_5ff0dad3820b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_5fdbdba941540.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378390/normal_5fee8c4f4e8e6.pdfIn PDF document text
    • http://nimened.66ghz.com/latest_mobogenie_app_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408002/normal_5fe90df8b8fa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412195/normal_5fcc55650596e.pdfIn PDF document text
    • http://wixiziz.iblogger.org/casacam_user_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486981/normal_5ff3b2c3b50e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374203/normal_5fc8f170a5d1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376127/normal_5ffb91110eaa5.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/gogunabones/sexugovulafubonejabepomif.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/fuji_mountain_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/99587082719.pdfIn PDF document text
    • http://widamifikifewex.epizy.com/mystic_messenger_apk_mod_2018.pdfIn PDF document text
    • http://palalujopaxuv.epizy.com/xomuwexujiteritanegokajat.pdfIn PDF document text
    • http://waruzav.epizy.com/fishing_report_folly_beach_pier_sc.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_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 5260 bytes
SHA-256: a4a73db0945350ff9e46e377379a0d8c499881c83071b6df62dec061ca7c1691
font_01_sfnt_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 10932 bytes
SHA-256: 024a0cfe5212e7874417bd2b986c2d9b4eccb6072f47294852fd130fe8fda474

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