Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b9bafeae05df1c…

MALICIOUS

PDF

71.0 KB Created: 2021-06-10 16:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e31236e3f06ab2bfdcc8c369fa875d42 SHA-1: 3d087eb6172ef8445d399a6e39495bbf0f5cef7b SHA-256: 33b9bafeae05df1cb409d67699e52a4bb1c42fe3c3241d008df34be0c0dd39c2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, and is detected as a phishing/malware trojan by ClamAV and an ML classifier. The document body, though heavily obfuscated, contains text related to converting OCR to Word, suggesting a lure to trick users into visiting malicious sites. The presence of numerous external links indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://queure.ru/pbw?utm_term=convert+ocr+to+word+free+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489977/normal_5fd28fdf09364.pdfIn PDF document text
    • https://bakinoxeveraj.weebly.com/uploads/1/3/0/9/130968963/newanekozotudo-teniwemuleza-dudinawuvik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457312/normal_60027fd40c1f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_60282b1ed474b.pdfIn PDF document text
    • https://kinojakabajowus.weebly.com/uploads/1/3/4/7/134774968/risel.pdfIn PDF document text
    • https://lezogifivejuz.weebly.com/uploads/1/3/2/6/132682585/visimufujudivad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_60506c09694c6.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/pitixe_xipisesijita_zoxutede_texoxu.pdfIn PDF document text
    • https://juzemadarerux.weebly.com/uploads/1/3/1/4/131437885/tuxagitufi_jerug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481068/normal_60bdbf5f8a7d8.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/632d671a549571f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504870/normal_5ffed021e7a8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_5fc69e386b76f.pdfIn PDF document text
    • https://mezobemubuzopos.weebly.com/uploads/1/3/3/9/133997151/godawasulivaweb.pdfIn PDF document text
    • https://danabemove.weebly.com/uploads/1/3/0/7/130776083/tilozape.pdfIn PDF document text
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/muruzefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384650/normal_602050d7d9490.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 4684 bytes
SHA-256: a9726528de3fe93096df80d80715c9c32f86eb22f5bf736318d3c5f7667f2ad8
font_01_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 10696 bytes
SHA-256: 7f391b53fc32f86bdd03d94116d946fdf5351accc29c0aa0a6e9781751e7a78a

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