Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd38f2e8211f3e3…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 13:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35891de0eac76e1598ae125737c5e898 SHA-1: fa90b0121847f13ec36c22452c325802c506eabf SHA-256: fbd38f2e8211f3e381d468c9df3d8c4af966a333301d3417a81caced9fca9341
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 high likelihood of malicious intent. The presence of a link farm on disposable hosting, as identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggests an attempt to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://mq-water.net/upload/duzamepefewimiputumul.pdf
    • https://valgott.com/images/userfiles/file/vezegevomak.pdf
    • https://ost-fogging.com/upload/files/tutas.pdf
    • https://cliniquemyo.com/userfiles/file/33583061995.pdf
    • https://childprotectionindia.com/lexcyberia/userfiles/files/povigobogoduk.pdf
    • http://miskolciharsona.hu/pictures/file/53589817967.pdf
    • http://kvrhousing.com/uploads/gulegusovomapoforaz.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/69369845548.pdf
    • http://sarica.com.tr/ckfinder/userfiles/files/gunapunazigif.pdf
    • https://lazdynumokykla.lt/userfiles/file/bebizonakiwekofodajo.pdf
    • http://konemara.hu/userfiles/file/kexowinosisurilot.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/79c87af279c114e23dec7509f110e8de/wekime.pdf
    • http://gabinetortodontyczny.eu/userfiles/file/pifokujuw.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/39382399198.pdf
    • https://angkaganjil.com/contents/files/fejiwo.pdf
    • http://feach.ie/images/uploads/file/jutepefalovezetisujo.pdf
    • http://nfc-lampang.com/user_img/files/jujuxoxadadutusegus.pdf
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/54580328914.pdf
    • http://baby-daycare.com/uploads/files/202109110259364642.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613c552d65171---18427594401.pdf
    • https://stcc-sa.com/motakamel/Ups/files/26493113708.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=root+android+9+magisk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e70b.bin
4be29aca66e070ef8430be8ef69ce7467d2feb945b0079cc287fe8f9242fbda3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE70B 18596 bytes
font_01_sfnt_off00011720.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11720 16792 bytes
font_02_sfnt_off00012f37.bin
dae625ec61870c503112c7e6d446237dba154d4d5e34d0234e872ae050f9d154		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F37 10716 bytes

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