Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed37b1530a1242f1…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 17:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abea31499888222f9fb9ffbe3550271b SHA-1: 0fbad432f0c369f49b5912fd8c75a93c7e483d90 SHA-256: ed37b1530a1242f1e4dec6b9fb4f1cfc173eb56221a0186f74c4b5e8c467a4ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which host PDF files. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an intent to redirect users to malicious content, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://powerfalcon.net/uppic/files/46665220306.pdf In PDF document text
    • http://srmtteaparty.com/uploads/files/202109011013591631.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210903191352.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/87080912857.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/winudijajopuronefezakofa.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360a74b5167---latob.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/13545825766.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/34118650260.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/rapudesozibivawut.pdfIn PDF document text
    • https://expomediainc.com/upload/file/21119873213.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/laworekeboranelogomid.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/zufumasuxobotafativosawa.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/78574161173.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/fororufunifijepuzemi.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/47896397358.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab860ee6f6---zikezivotaxanujukux.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/turimojurojejinemodakad.pdfIn PDF document text
    • http://rcot.by/pics/files/zafiboraxamujifax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cambiar+resolucion+de+video+en+androidPDF 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_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 10768 bytes
SHA-256: 49621629cd5f4a36d203f60a9d4550cdf276b6de0dc707cfe9e9ab6be7a28b0c
font_02_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 19152 bytes
SHA-256: 8b0674022a9c9c107930c2de8f9eaca762e5fe760ff04a464aedf39d6bff14e8

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