Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35fa9491d6dc70f…

MALICIOUS

PDF

82.5 KB Created: 2021-03-16 15:35:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 265bc78563d41ea8b0501d7fc81b97d8 SHA-1: a66f9963854ada432e6b8f3cf3910402d9cd3342 SHA-256: e35fa9491d6dc70fbb687a23305f340c092fe364d89fe34cea1c3ddf84725e58
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/award?keyword=late+bilingualism+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409103/normal_5ffbb7d3cfbd0.pdfIn PDF document text
    • https://rojofasefimo.weebly.com/uploads/1/3/1/6/131636828/bedefuxikuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_604b63b300597.pdfIn PDF document text
    • http://naturalik.fun/how_to_do_trigonometry_with_an_isosceles_triangle5lpba.pdfIn PDF document text
    • https://jederatikepu.weebly.com/uploads/1/3/4/3/134370591/dekowifodat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367643/normal_5ff5b3354db91.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/what_is_ethical_dilemma_in_nursingcr7gl.pdfIn PDF document text
    • http://eroganoficial.site/xutafizuwaxowosufupiwejav0m9s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_6042f6359dd15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465702/normal_60072f47e0f85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_6feaaefd6d424039aec1ef8c74173077.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/cloudformation_s3_bucket_encryption_example.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/kelovotiwipa.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/gmo_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/chahat_ki_barish_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/2018_frm_part_ii_practice_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/55402736733.pdfIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_1812086d77804942a323515f76ce78ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/71763426390.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/93299226717.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_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 5344 bytes
SHA-256: c8d0feabe8109ab8369ff324162b40e626f2b56818b85e14ead83acec3be9454
font_01_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 11364 bytes
SHA-256: 30079f913cf428cdf51c0814a5e29cda3e52eec9b4da92998da39881c96bd256

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