Malicious PDF — malware analysis report

Static analysis result for SHA-256 b273149cfca0b19d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-20 22:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f21f4c3ff44905bf454323476bc3e7b7 SHA-1: 28152506c764d41167e260fff8844b3f916812b5 SHA-256: b273149cfca0b19d94c783801d44d816e95f5b058d2be314314a8ac80a081185
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files on disposable hosting, indicating a link farm designed to obscure the ultimate destination. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://elger.cz/fckphotos/file/gezozetu.pdf In PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/wovimubimegotidomulug.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///nabonixidex.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/vrvh44plj3j3qmcpmabim7v87g/87448532629.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/fuvavigizegeji.pdfIn PDF document text
    • http://rrarental.org/upload/file/65625225851.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/65666911024.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40535611400.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210916062627.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/71792283162.pdfIn PDF document text
    • http://aa-nusd.jp/lepoledepeselikopuxili.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/muwujagitipekemesanatij.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/84444304551.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210916003513164.pdfIn PDF document text
    • http://xprchemical.com/upload/files/67302198803.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/200256275472.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/batatotanenivixiruto.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/18151645378.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/25853455555.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/gosuxejasifibikajiva.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/vezagomex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=reasons+for+dizzy+spellsPDF link annotation
    • 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://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_off0000b67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67C 10612 bytes
SHA-256: 86cd9b7afe1dd4fd94a131a0b8865b6597a9be0ea561e0ef2b03b79e0916072d
font_01_sfnt_off0000cee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 15720 bytes
SHA-256: 19c692df431ca35d26290a504e40b3c536a26621531dc5e8baad051d333cdd69

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