Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a9dd2c58b71c97…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 01:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34f0220685f92e466f21051dea613189 SHA-1: a1e8c4eb07065cf404c0a8b3f7c62e8fbab1c6f0 SHA-256: 40a9dd2c58b71c975122accc7f046a2dc5fc3c25545fd7ddb16a60894f3aa2e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The embedded URLs and the PDF structure suggest a link farm designed to redirect users to potentially harmful content, possibly disguised as a game download. No scripts were extracted, but the overall structure points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://thegmsbihta.in/userfiles/file/nasobojijodejepigugile.pdf In PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/puxodolumomosamigudipus.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7088809296.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/jemiforafemizopufu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/2cb7b53ee5461decbe03b003d93c7b4b/bowamopibi.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/17981945749.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367e19f00c0---posatogarifegura.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/56275715991.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/40523726826.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/32003012267.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/gadejizaxavukegipufusawid.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/fatetu.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/52422896633.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/71225851981.pdfIn PDF document text
    • https://cristalensi.com/public/File/subefubilosi.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/vubukefe.pdfIn PDF document text
    • https://ratosatu.com/contents/files/guguvokusinafolijokigepew.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/kibebekoripuwumasivow.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/83435496754.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210914052012.pdfIn PDF document text
    • https://hsse.cl/files/37913936056.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/rinulafej.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/fezajimododalukupuwokoke.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/78996657591.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/dezizivetima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+robbery+bob+mod+apk+android+1+comPDF 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_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 10892 bytes
SHA-256: 5fef71f81847c02acf910d5693bf2ae0284dd52f6f39f6a8a1bfe3128133d196
font_01_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 16820 bytes
SHA-256: dfc2ca28df00b9ada0d38985257545fc4d8e5a5dfeb672a027e4a3915201ec14
font_02_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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