Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b444822e41e4af…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 13:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18926fb60c8a5b68e489c686517142c0 SHA-1: fa623c80e4cffc48f9cf33bb1c0ba8822dd73ca9 SHA-256: 10b444822e41e4aff57dfe53ab1918a95b9aaaf2f37b4bf57853d0bf7e4e9fd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://krisoc.ru/uplcv?utm_term=paper+io+download PDF link annotation
    • https://insinkerator.us/images/uploaded/file/zabufon.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/64833634944.pdfIn PDF document text
    • https://denimder.org/resimler/files/17703550305.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631179905.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/gerodewixadasafigutowoba.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/wugowufujovog.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/ninedenatimuwujupefagu.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/komomuwotanadebimisuzepi.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/66089795411.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16136c1c31726d---70253701445.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/77173949479.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/mowudofobikuraduzug.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/pupelewogajofadimuruxena.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210903050652.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210907185329.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/lifatobediti.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a17ec6352---fekaletok.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/93208757550.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/tomiseriwewubofofagiti.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/31112383170.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/84655696689.pdfIn PDF document text
    • https://izometal.net/mm/file/96929249998.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/luzufakovu.pdfIn PDF document text
    • http://gojjang.com/uploads/files/wefij.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/zukovututopujep.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_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 17432 bytes
SHA-256: fc0f64275b9d1e0874a6035538d196536597eb4df40eb6ee7b6d0f30fee6fe11
font_02_sfnt_off00012696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 10204 bytes
SHA-256: 7b9dc9dfe94bacc6d4794a1fe42fe6081e6b69acbeb2288e5685fbf0b1e9b03b

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