Malicious PDF — malware analysis report

Static analysis result for SHA-256 434b80e65a632175…

MALICIOUS

PDF

68.8 KB Created: 2021-10-04 01:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 459ee80f243a64d7488d034d337b626e SHA-1: 4e40470d320f94b2a4ae077ad539a5fb1896fc8d SHA-256: 434b80e65a6321753abe1da934378f67c0ff39c8a0fa264af8ec44d8af237eec
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. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attack pattern involving directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://nusantarabet4d1.com/contents/files/gofejabexeka.pdf In PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/94586745136.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210908/file/43961415157.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/satadazudeviluzevok.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/rewazujomuxenariforo.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/dibonilo.pdfIn PDF document text
    • https://docommerce.co/calisma2/files/uploads/59888889868.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/41116985311.pdfIn PDF document text
    • http://arablift.net/userfiles/file/78283834313.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/42123183720.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/tewes.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/91777440256.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/92364336108.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20211001135153.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfb1e8bcf4---podazobumigizetejutez.pdfIn PDF document text
    • http://ippon.lv/uploads/File/sopagazavexuxitoti.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/kamabejotajab.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/befuramawaluzen.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/wimipojimogutidel.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/82385082753.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210908140717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+dow+at+right+nowPDF 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_off0000ac93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC93 10428 bytes
SHA-256: af791892d10171b3f87f1699f674c5e943477e4989e30284d67c2899ef1058ce
font_01_sfnt_off0000c403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC15 16360 bytes
SHA-256: 8cd4552787f12a5efb364c02f1535085ec85c24c0a5d7ee871d97a1c8259837b

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