Malicious PDF — malware analysis report

Static analysis result for SHA-256 53460e8dc2c88ac7…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 08:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab1094b6dd4fefb7c3b45793a7667e59 SHA-1: 8e612d4643a92befc1e5fd3643b85b258cf9d2df SHA-256: 53460e8dc2c88ac7f6f507a8c29f63b23406687f5fb264411f41186766cc56d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used to distribute malicious content or phish credentials. Although no scripts were explicitly extracted, the PDF structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://sinosteelcode.com/filespath/files/20210914053417.pdf In PDF document text
    • http://rmgoals.com/userfiles/files/sirorenofopupifalikota.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/11115854503.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/31681648405.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210909223218.pdfIn PDF document text
    • http://napiarsaigh.com/images/7845345225.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/gunipifimizomaliwemu.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/99426028149.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/fumudufivugasonatu.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/wugawomuxidutusut.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/27099350468.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/7479604732.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/pejizi.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/xowonilixaripofu.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210914115106.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c28732e0---45636623865.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631589633.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-5/20210905023338230808.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/tigaxowobevixitovidalegan.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/nepametegobubuvonolirozer.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/72574794001.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/porimefefaf.pdfIn PDF document text
    • http://teknis.it/userfiles/files/puwuxesin.pdfIn PDF document text
    • http://jsdarvin.com/files/jenezir.pdfIn PDF document text
    • http://jadeite.ru/images/file/mojizibanogikop.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/2669047734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what%27s+aoss+button+ps3PDF 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_off0000d703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD703 10420 bytes
SHA-256: 1f8d499eb1e7a29a308a9c4f339c016cc6aa76cf0513f0d867aba1ce013ef934
font_01_sfnt_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 18124 bytes
SHA-256: 6bc2a8e5c8ecd1c4bed9da7669f91966170f617129f9e6c9e91f4710ade7baf6