Malicious PDF — malware analysis report

Static analysis result for SHA-256 c834bc574c79b14f…

MALICIOUS

PDF

67.4 KB Created: 2021-02-20 22:06:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: be7e6b9a835b0158db38992187362224 SHA-1: b13fcba495d9bd54473e4a94a869c5a4c19d062d SHA-256: c834bc574c79b14f9122afa18fc9c767a0783b6652c01db0e595c6ff644ddb49
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'jacksth.ru', suggesting a phishing or malware distribution lure. The PDF structure and embedded content, despite being obfuscated, are indicative of a malicious document designed to exploit users.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=living+buddha+living+christ+20th+anniversary+edition PDF link annotation
    • http://fugoverud.iblogger.org/ansys_fluent_tutorial_book.pdfIn PDF document text
    • http://guginegafofa.iblogger.org/68720925671.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374839/normal_5ffa029da0e19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5fd8f8754add1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393180/normal_5fe4161d3766e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_6017f6cda4dea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488323/normal_5fda90ea87254.pdfIn PDF document text
    • http://parawabasufubep.iblogger.org/22652113996.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/vojapu/3d_geometric_shapes.pdfIn PDF document text
    • http://jedejuleler.epizy.com/handwriting_practice_sheets_for_pre-_k.pdfIn PDF document text
    • http://jepogedepujadul.rf.gd/93044484484.pdfIn PDF document text
    • http://lexawelezalum.epizy.com/jimobadoxijaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/jepedifupazeju.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/super_champ_x2_head_review.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_off0000ba33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA33 5600 bytes
SHA-256: 09bc5fbd7e223f8ce067eb922a7e4a0330ed65c367ebaf2992a4312ecd20d838
font_01_sfnt_off0000cd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD35 10836 bytes
SHA-256: 98137f85097ff9f6fe0afc147e3eecad12733b16a535717582a6dcaba2e14dd4
font_02_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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