Malicious PDF — malware analysis report

Static analysis result for SHA-256 69736a4df83021d0…

MALICIOUS

PDF

69.2 KB Created: 2021-09-21 17:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cc6083c7581c0e54b6f5b8014d0eb47c SHA-1: cef48fa59915b7d955bb3bf29977cb35d21c1ef9 SHA-256: 69736a4df83021d02254ff51eb31d71767d945114f4238e9a05c1d5639541817
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 embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content point towards the use of JavaScript for executing malicious actions, likely to redirect users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://zulassungsservice4you.de/bilder/file/fafuren.pdf In PDF document text
    • http://capital96.com/userfiles/file/nasuximevubi.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/93034421254.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/6841360293.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/vegavijalugalijuvemagi.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/zijakekodurigol.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/2939415787.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/gotowomuxuf.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/o46u377m7m2u85b1t9nep41ipm/gulaku.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/mljmme9qu2rbctqb930acord54/79586316065.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/17465867409.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/zuxozajofaxanovosebe.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/susafug.pdfIn PDF document text
    • http://maha.tcnme.com/chop/multimedia/userfiles/file/20315513469.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/45092703092.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/xupikasakuvorenupubuxez.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/24810831470.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/66817013761.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/sujubiditanoneneludo.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/negaperesaxebirifa.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/getejosovaneporotan.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/sexeturubetufiwexagun.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/zozugadivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=roblox+2016+apkPDF 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_off0000b39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39D 10392 bytes
SHA-256: 47972ba30f8fde34fced56cc176da04170b5a0fdf73e34c6820745e71cf0ba40
font_01_sfnt_off0000cb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32B 14544 bytes
SHA-256: ec43799182411fcb7a5d6a1369314d56301123a8eb38a006986f806c9cbc75ff