Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16ce22e87123ba0…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 04:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d16ece18e60b62c007438ab549eb30a4 SHA-1: 84bc1eaa42f598de7b679b548e4d1e76df433371 SHA-256: d16ce22e87123ba095b6c4bfdcbe2cc5dae487c2163db7f18f92a6e2391591fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the PDF is used to distribute or link to other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://files.ibiza-ferien.de/file/23133413162.pdf In PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/soboziwosuso.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/90489692033.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/82070968083.pdfIn PDF document text
    • http://bociany.sk/media/file/pegamagawotur.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/45923111892.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/e65bfb5dc32cdf888ac9e054e5f1db26.pdfIn PDF document text
    • http://minerva-collection.net/files/files/33159804670.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/xokafodapuno.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d943790fd---77664940505.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/38813833212.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c518475988---69349940298.pdfIn PDF document text
    • http://princeverma.in/uploads/files/53726671013.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/laliviwesejelulupo.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/fitel.pdfIn PDF document text
    • http://mcutech.net/files/23399350219.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210912011503.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/rapivi.pdfIn PDF document text
    • https://protrialse.eu/files/files/479323314.pdfIn PDF document text
    • https://emenu.hu/editor_up/guxoma.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/71862018522.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/gasaxowoduwadafik.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/53864682177.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/11096493999.pdfIn PDF document text
    • http://master-vin.ru/files/file/29623866345.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/32716924092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mi+tv+miracast+app+downloadPDF 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_off0000c2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B9 10688 bytes
SHA-256: 8df3e61af95becf767425c07d4ae518a8203b3012516faa51914e6ab5d515bc3
font_01_sfnt_off0000db42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB42 16308 bytes
SHA-256: 8569b1040c552034acf59b64ff2a868ccb50bf7fadcca79f7b9273ff4a7274f9
font_02_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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