Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29cd957e2501501…

MALICIOUS

PDF

90.8 KB Created: 2021-06-01 21:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0c0902b797d6efa2f4ad8dcc64ac6c86 SHA-1: b40c6cb9e7fd70e9bf7d13a8bfc0963d67841846 SHA-256: c29cd957e2501501eb8523749203bf0b1bdc2788f1676ab1433bdfdb1dea212d
126 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 ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains embedded URLs, one of which is associated with a link farm and a search term suggesting a lure for downloading an 'apk'. The presence of external URIs and the nature of the detection indicate an attempt to redirect users to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/123?utm_term=netflix+hack+apk+2019+espa%25C3%25B1ol+descargar PDF link annotation
    • https://jipunone.weebly.com/uploads/1/3/5/3/135349916/6273387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_6011e02ad7df5.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4479435/normal_60b568ea00db9.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/5828080.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4411702/normal_60b379aeb2d58.pdfIn PDF document text
    • https://fitadidexedas.weebly.com/uploads/1/3/5/9/135977916/5af38b59.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4461201/normal_60b11f91386b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394077/normal_5fff29159dddb.pdfIn PDF document text
    • https://nabizajeti.weebly.com/uploads/1/3/4/6/134640454/dujafapuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470028/normal_6060f9b864dcc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jajisaparev.pbworks.com/f/69423186595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f10799-a6bd-4ef6-9355-742a87f9db10/nyssma_piano_level_4_scales.pdfIn PDF document text
    • http://siruzosu.pbworks.com/w/file/fetch/144449502/90945992910.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/how_to_journalize_accrued_salaries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15750d71-5b29-4f49-b8f1-cb2c803da56b/three_pillars_of_zen_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8897dcca-2f99-488f-a5a6-09f4abb8aa48/97665881852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e7eb5c-fe7e-4a32-ac3f-6558dae589c2/tovojawus.pdfIn PDF document text
    • http://sorawako.pbworks.com/f/kesler_science_answer_key_periodic_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1661fcaf-c187-4645-b43b-7919db71cc44/36723686840.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144451566/pradhan_mantri_awas_yojana_pune_application_form.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 6212 bytes
SHA-256: 13500385e7455bce529fa5a2d323d079189415ae2f01c4a6372342ebedcb8c48
font_01_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 12680 bytes
SHA-256: 8e949c43d8f32b12408962c2291b0a4ab235633e135697cc8a2befaf33d21a71
font_02_sfnt_off000145eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145EB 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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