Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fcbbabb9b484f4…

MALICIOUS

PDF

88.7 KB Created: 2021-09-16 11:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 926ea933b81c231a0a11ade959ac7c26 SHA-1: 624315bfe402edb4813b1afcfecfbb053b7843f7 SHA-256: 97fcbbabb9b484f4bdbeb719c0b19aefad917af3fbe63158ca0f5022f5369d1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and an ML classifier as malicious. It contains numerous embedded URLs pointing to external domains, many of which are associated with link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, with many links designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://oniceh.ru/uplcv?utm_term=osi+model+and+protocols+used+in+each+layer PDF link annotation
    • http://duet-czluchow.pl/userfiles/file/41655062736.pdfIn PDF document text
    • http://ippon.lv/uploads/File/suzadizidefojepidatuval.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/tagezoteru.pdfIn PDF document text
    • https://cet.sk/res/file/witabi.pdfIn PDF document text
    • http://xenangheli.vn/public/files/88763542410.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/mujike.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/47811273357.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/15174192749.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/41160773238.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/xuzokopipovumewoxipusa.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/fofitowojiwojevon.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/50079916436.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/46200328604.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/befarutasonefejemowuzig.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/ronuwate.pdfIn PDF document text
    • http://mestan.by/images/file/zosapunor.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/muxizek.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135ec2a20992---92354672994.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/7818052114.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/47616634497.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/81202515541.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/fowizijokumifagirepinuzuj.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/nixuwe.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_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 11016 bytes
SHA-256: b37ce5c22a8e6ff31ede40022634b3a16ea1e2d1b8d12501a58670fffaa3fc28
font_02_sfnt_off00012893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 17120 bytes
SHA-256: 8228317011c909787e551a710e7d099205285e98586521353909d79f06559688

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