Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0806bfec7900ca6…

MALICIOUS

PDF

70.4 KB Created: 2021-09-21 17:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff0151d32e4a90a3fcf8ebd04a888091 SHA-1: fae190a3f7c62f7334b4eeca730de0fd89a05711 SHA-256: b0806bfec7900ca620ef5ac87a7810e939a0e00b03602b01b90c4c584a37a5a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=talking+ginger+mod+apk+unlimited+money PDF link annotation
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/90fc893d05b6c321150c84768e63e9ff/32475439230.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/95811651051.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/bumoposopovi.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/27302057166.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/wotifanamunukota.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/91865061521.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/92380165650.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/busitepetalamaxipiz.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/tigulexuterevujike.pdfIn PDF document text
    • http://villkasz.hu/editor_up/jexikadari.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/76209219234.pdfIn PDF document text
    • https://kaparatt.com/images/File/75490099018.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/timofulixenuxal.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/57820823774.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/74761655215.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/64418694375.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/69308153438.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/31482819926.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/78131489348.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/88079580016.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/42750389286.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/11767217879.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/33966735303.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_off0000b4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E5 10836 bytes
SHA-256: 2505dc75bf47ba299f18d1bb218a727a1dac815fafc4ab6edd7930c274044776
font_01_sfnt_off0000cda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA9 14912 bytes
SHA-256: 70393fd1a5ef11686c3d954bf93c8981327286ea1dcc393022ba5496af22152d
font_02_sfnt_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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