Malicious PDF — malware analysis report

Static analysis result for SHA-256 27936f374591a121…

MALICIOUS

PDF

64.7 KB Created: 2021-01-08 19:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a5bb3277abb9101bd0edb68e9fa5931f SHA-1: 05875088ad0ab44d1f092ce105b805274ac879e4 SHA-256: 27936f374591a1215db9673b62f6847f0bda955c522e3ce6213af112dafc7c05
154 Risk Score

Malware Insights

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

The PDF contains a link that directs users to a URL associated with malicious redirector infrastructure, disguised as a download for 'root explorer apk old version'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/123?utm_term=download+root+explorer+apk+old+version In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375696/normal_5f8fd8d94039b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485800/normal_5fe0a1c027de5.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/fJjagie/43190676065.pdfIn PDF document text
    • https://cdn.sqhk.co/sobutexe/iTGgchc/59148736982.pdfIn PDF document text
    • https://cdn.sqhk.co/puwonereb/XA0Wegd/lemonade_hero_best_recipe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469824/normal_5fcdc44f108e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446287/normal_5fa343980ef3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490365/normal_5fe99d7075bd2.pdfIn PDF document text
    • https://cdn.sqhk.co/golizojuw/PRsDjiy/47746615411.pdfIn PDF document text
    • https://bazademirijef.weebly.com/uploads/1/3/4/4/134464354/figepijunuwojir_luzawapab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388612/normal_5fa68906f280c.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/gurupixabogivaz/bassoon_and_piano_free_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/galuzirasogetisotid.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/recommendation_letter_template_for_grad_school.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35C 5236 bytes
SHA-256: 16231c5af0416a4d20340463ce9f945d148b1038f022be3f0061b9377d00379c
font_01_sfnt_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 9548 bytes
SHA-256: eda1b5f6b288ffa7289f8430642f287283d76f75b47ce8d0162038e83d5126dc

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