Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b26fccee7dbc28b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 22:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c5af4d1081d169a61853f238e0269ed SHA-1: f85cefbee7591b09255dd8b749e09398d4a85577 SHA-256: 0b26fccee7dbc28bd44227b6f754468d5c7b751eb75e1ad228812b8f917d2d38
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm, with numerous distinct hosts and UTM parameters, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oxigensupplies.com/shipinc/userfiles/files/64962929905.pdf In PDF document text
    • https://groupburuemas1.com/contents/files/6713867619.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/12282294019.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/nexinosalemipiwofijejaga.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/jevinetolomanej.pdfIn PDF document text
    • http://hijoin.hu/editor_up/56693523648.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/86973469910.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/65870280664.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/ditususigesenabanikox.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/50179984943.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/geroleva.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/10880772039.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/91913265147.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/71986677947.pdfIn PDF document text
    • http://lejuriste.ru/files/file/76984424028.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/69290370848.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/94022709557.pdfIn PDF document text
    • http://sayarbobinaj.com/file/58890050095.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/sotazag.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/janoluwizapesami.pdfIn PDF document text
    • http://orthodoxnews.us/file/12604116244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=apk+pokemon+tcg+2020PDF link annotation
    • https://b2cdemo.tickets.com/content/files/vitenogosexilemonop.pdfIn PDF document text
    • 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_off0000d1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C2 10464 bytes
SHA-256: e81a63479f45d8519df617cf5a5910ccc16b0f7e31c0f1ebcaec081e7927dda4
font_01_sfnt_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 20640 bytes
SHA-256: 429b1aabc516e949a0b9b48d8880fc8ae15e9628e34d6625561c5ee92b5bc389
font_02_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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