Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bbf8479dcdfd1f…

MALICIOUS

PDF

74.4 KB Created: 2021-09-22 17:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7dd73ebb0e1ea49df0b4ced2f7f05812 SHA-1: a4413d8730a179e07c6876c6924701641da019db SHA-256: 76bbf8479dcdfd1ff6ecb2e97b5076c3bd8e6d0d28c18e6a9c7165a0e7d217c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=run+5+cool+math+games PDF link annotation
    • http://kenhuffbuilders.com/userfiles/file/mudulifeforuge.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/lipowo.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/28979120322.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/rewalorizotajimevuwik.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/xevosigo.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/65484950940.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/mesowemugawazazirotetu.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/81996148589.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/35026485835.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/35722288483.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/koxuxaxebedilimamonuf.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/felojofumupejewusupebume.pdfIn PDF document text
    • http://cutskytools.com/d/files/46716014050.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/c2ae2333463b062f922c1d9da1fe4261/32588128328.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/bewagufus.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/zonozipolasiriwanifo.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/6555956742.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/wezubagepaxumuteporelesav.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/19590124471.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/87421447404.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/48581456481.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ok446o52lfs9kim0rv89qd6vc5/dadujovigon.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/vorolafusibatamojovog.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/bojopubelor.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/63046425263.pdfIn PDF document text
    • 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_off0000c0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DD 16572 bytes
SHA-256: 34deda01dfafa72caca0f877d13d85043d7d0aeee99d1be892392fda2536b4cc
font_01_sfnt_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 10764 bytes
SHA-256: b31e2eaf27b0de325beda58eb566b755f1841976295cc927adf5b2b3b455d279