Malicious PDF — malware analysis report

Static analysis result for SHA-256 916e0499744ca948…

MALICIOUS

PDF

79.1 KB Created: 2021-01-18 15:23:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 66b653954df33fe1a36cd231c8d7763e SHA-1: 7c762abd7492ec26739d21751bd06cb64197aa90 SHA-256: 916e0499744ca94819a48a125dc8c6a5b25b0161a96416d859e36ae14a17082d
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, indicating a high likelihood of malicious intent. It contains an embedded external URI pointing to 'jacksth.ru', which is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to 'quality and productivity books'. No scripts were extracted, but the presence of embedded URLs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

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://jacksth.ru/123?utm_term=libros+de+calidad+y+productividad PDF link annotation
    • https://site-1166725.mozfiles.com/files/1166725/kesev.pdfIn PDF document text
    • https://site-1178836.mozfiles.com/files/1178836/best_instagram_tags_for_portrait_photography.pdfIn PDF document text
    • https://site-1257848.mozfiles.com/files/1257848/barorreceptores_e_quimiorreceptores.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_5f9a09c9b6a1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500893/normal_5ff4966298d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454684/normal_5fb8c2d6dee7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_5fa83a2443000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489247/normal_5fc123ce8ba45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388416/normal_5fded0fe9f343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485443/normal_5fb74b476ff84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_5fa1933bdfe0a.pdfIn PDF document text
    • http://diletemofuvufu.22web.org/captain_america_movie_in_tamilgun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fd66de6c5333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5f915b9be4263.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
    • https://s3.amazonaws.com/fomudebipefasu/sfdc_lightning_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/sodoxi/dragon_city_gem_hack_no_survey.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_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 5088 bytes
SHA-256: 3a0d66ae9f250dfc291e2e5765a67e4e75e0e969a1947c290acfee3e4c11256c
font_01_sfnt_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 11712 bytes
SHA-256: b587ef941acb210c5271f5440910e737880794ad46e1c44474260fd3e28d3eaa
font_02_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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