Malicious PDF — malware analysis report

Static analysis result for SHA-256 81332c327fe82f20…

MALICIOUS

PDF

87.1 KB Created: 2021-10-21 07:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 192fa98afe5580cc307098b0c8a42623 SHA-1: f9d8ab3631ceebfbfd4d5142e33500e7a175c7d5 SHA-256: 81332c327fe82f2038f5d0fbe00e1625312379b729e38f7200abf19739ee958b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic specifically identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://aroma-es.site/yamituki-n/uploads/files/69037866813.pdf In PDF document text
    • http://hurtglass.pl/upload/file/kutojaniwodixebetoravef.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/65343138433.pdfIn PDF document text
    • http://nemochem.cn/upload/files/jineraza.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/69300620973.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/nofawitaj.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/pazatamoso.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161607e7dee5ef---20611155566.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/wamibage.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/jalowewederumopi.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/xujuvavokofi.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/tarus.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/sizope.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/pibufovonedagukuxewa.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/zejimisife.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/wawodotitipuremalobevij.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ff478aa178---38136554662.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/rokidedufupuwiz.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/vatenazewo.pdfIn PDF document text
    • http://fxlcd.com/upload/file/67207790773.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/83996480515.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/39482926522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TSvcnjQ06Jg/uplcv?utm_term=excel+if+is+not+blankPDF 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_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 19812 bytes
SHA-256: d7ce2fedc9d1df895b0f5b4a044573fa276852aae4469bede32d2cb3cf5a5699
font_01_sfnt_off00011e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6B 10548 bytes
SHA-256: a33590bb0fdc2cc54db339aaa1a0b127ec21ef2b9e141711ad5cb9ec84859e4e
font_02_sfnt_off000136a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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