Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f58942696141bb3…

MALICIOUS

PDF

95.3 KB Created: 2021-06-08 12:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bc8e6fd78c502ab391a8895f8f854a4f SHA-1: 15f1f64e3fee4aefd43e8562a0751fe9897af9d2 SHA-256: 9f58942696141bb343ff407caabd1bdfe97787c22b077f749a2bcff0e0ef1cf9
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'pistant.ru', which is likely part of a phishing or redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to a search query, suggesting a social engineering tactic to drive users to the malicious URL.

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://pistant.ru/pbw?utm_term=when+did+the+second+agricultural+revolution+end PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465386/normal_606bab4186d4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415740/normal_5ffde1379480e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475564/normal_606d6acaad312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454967/normal_60102021ed436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_602690d94f5a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_605673abb1b13.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4370269/normal_60b4b18d16f50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384160/normal_6004b4e43ad79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_60354a22b92df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502268/normal_5fc79f7ddb3dc.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4368747/normal_60b65db0daf28.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doxawadar.pbworks.com/w/file/fetch/144513276/lixat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a17381-fa3a-4bd0-afe3-39e70c1884f2/42185923057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8e95b5-3265-4ed3-8d32-f2d18a88fc42/easy_gluten_free_recipes_for_toddlers.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/w/file/fetch/144558069/gukuzagegiwupajukegudola.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144413496/razonamiento_logico_matematico_santillana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c70385-7ae2-4fd1-bd16-9cf8aee41214/97600186904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/399b2f06-d94c-44ce-aafe-8e858a36039a/45017827251.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_off000136fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FA 5272 bytes
SHA-256: 1509eb299ced41b207d7dc9ca417e27972ad96f7f45dc89ed489bc213cfd297c
font_01_sfnt_off000148f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F8 11316 bytes
SHA-256: 6ba1ba73a859a164484afe5ead8b0cd149d54e88437a63212d01fd606f6b7b97

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