Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f2b44b348f7cd9…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 00:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45048508523b7a2e20764297853bbc6a SHA-1: 80d2054d3e9c8e2e3a2da1973ecb2f6c1c065728 SHA-256: 75f2b44b348f7cd91ee5435294122f6469c805abf897e83a35cd2e872dde621e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable and used in a link farm, a common tactic for phishing campaigns. The PDF structure and embedded content suggest it's intended to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aydinservis.com/ckfinder/userfiles/files/57519769461.pdf In PDF document text
    • http://maroba-zirndorf.de/file/jidaseluragasik.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1631138005538045112.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/gelubifaropalijovumed.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/lonalojuvotigibe.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/73505583384.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/77662467957.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/xusogizewipelorijudoxefeg.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/daviratokijizu.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/59344146131.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/69319395364.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/kidejax.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a2992cbf32cf14408a863aa0a5dd15d9/71381348024.pdfIn PDF document text
    • http://kaies.net/upfiles/file/tamipovuno.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/46421723754.pdfIn PDF document text
    • https://rinducm1.com/contents/files/44569426132.pdfIn PDF document text
    • http://siangyun.com/upfiles/editor/files/93654474510.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/parifenuna.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/nakofajiwe.pdfIn PDF document text
    • https://priscar.com/documents/files/57795185145.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/debiverawiduvidasefil.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134319485a2b---kajifofefakukulelavibaf.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/65484478474.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/32288253048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=top+antutu+benchmark+phones+2020PDF 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_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 17948 bytes
SHA-256: 62edcf9b9404b5f37e412e47933be81ae1d9448755fc33c5da01f31236482b81
font_02_sfnt_off00012969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12969 11036 bytes
SHA-256: 4e7cf6260a8a304de778c75cfe1de26c62aba40350c4e3fdcb6e893188649934

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