Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87b037350ff5232…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 03:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59f7fd2a51a4aa2b2e8660c751ee4694 SHA-1: 1ff6b33731cc271846808a42c59ab58d8653c81c SHA-256: f87b037350ff52321880e43ee88edadbc5ba8f1dc7b1bdca01850a1f99c1ef28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an intent to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://doellefjelde-mussemarked.dk/images/newsmail/file/75460401648.pdf In PDF document text
    • http://arqing.es/ckfinder/userfiles/files/35548479027.pdfIn PDF document text
    • http://kd-council.com/upfile/files/xaginajediz.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a92a4863e7---83815511927.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/zopogotulupazabogod.pdfIn PDF document text
    • https://domilot.com/uploader/files/mozimaxuwaz.pdfIn PDF document text
    • https://33mobility.net/uploads/files/zamukij.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210908_9B6FAFC6B35DC66E.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/fuzerugisepa.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/62556847017.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/kebimomaxofuwejazos.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/10117098447.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/5009257990.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/34744923155.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/45494137148.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/754eejfh4gi4l44u80nt6og5c7/gojemewa.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/92839983011.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/61269617482.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090310463039.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/8083135033.pdfIn PDF document text
    • http://wernitznigg.at/files/xebutedurenomufamarag.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dutegipapasovusafijigakel.pdfIn PDF document text
    • https://manenshop.com/upload/files/lalijikifigupegarus.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/viresovexukexav.pdfIn PDF document text
    • http://accronline.com/userfiles/file/vuwufal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=can+you+conference+call+on+telegramPDF 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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 10664 bytes
SHA-256: cc793dbcde5f188b111d4ac103bde91f679e13b84eb5629064b9bf62b8270142
font_01_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 17176 bytes
SHA-256: 4b99de6a6284f808f2f0f703fef5847ea99430abc5acec1abb09f9ca776ffbf2