Malicious PDF — malware analysis report

Static analysis result for SHA-256 97331785fcc35622…

MALICIOUS

PDF

71.2 KB Created: 2021-09-23 00:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9275d9c04d6af0b3baa122f1566d6e28 SHA-1: 96cdd594a982f9d9614aab0b651f837045195a90 SHA-256: 97331785fcc35622f9008104c04eb5ba009d05bd6eec655221fdfe9b9430babc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which are on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://sangolongphuong.vn/longphuong/news/files/vakipupokabogilixiki.pdf
    • http://namlinhchivietnam.net/userfiles/image/file/22357787768.pdf
    • http://erpsamik.com/ckfinder/userfiles/files/76853479491.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/12621647642.pdf
    • http://preciz.com/uploads/wysiwyg/files/zamirirokizom.pdf
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/29050592159.pdf
    • https://olamare.com/img/uploaded/file/91463612139.pdf
    • http://al-bandak.com/userfiles/file/42047164700.pdf
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/kiwifexusomifofetizukemur.pdf
    • https://calienglish.com/ckfinder/images_store/files/fenefeluj.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/zewobonomenabix.pdf
    • http://shuimotongyuan.com/userfiles/file/94784036422.pdf
    • http://geologocarmignani.com/userfiles/files/33999159789.pdf
    • https://s-oil.hoakhanh.vn/uploads/image/files/lerevifufenuditur.pdf
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/rabikapiluwelinasonuveve.pdf
    • http://ledspectrumthai.com/ckfinder/userfiles/files/jiwonor.pdf
    • http://geyikkimya.com/userfiles/upload/file/rexeritikomomib.pdf
    • http://shipsupply.ru/userfiles/files/57478404196.pdf
    • https://lwim-ouargla.dz/ar/files/33817107857.pdf
    • http://arcenevents.nl/site/upload/files/92586853624.pdf
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/zirozuzubifasulorojegav.pdf
    • https://simbhaolipower.com/images/file/31671290226.pdf
    • http://ksnjl.com/userfiles/files/6629894677.pdf
    • http://elistaprezentow.pl/userfiles/file/40589241643.pdf
    • https://pacie.vn/web/uploads/files/85382137522.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=farming+simulator+20+for+android+download
    • 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_off0000b45a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB45A 16792 bytes
font_01_sfnt_off0000cc71.bin
178a51815c762453504392ece32ae7126703aaae9a1c2d3dcd7eb263bdcff71e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 10968 bytes
font_02_sfnt_off0000e5be.bin
51edea1a2510ab031c7f1171a0e01baa3d81fb309e70d26f74ab042607e91a69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 16432 bytes

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