Malicious PDF — malware analysis report

Static analysis result for SHA-256 e147b5e69177daed…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 06:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 194834bb8e946f8df36b3cacdea5e92e SHA-1: 1ae4b321e1ec333903ce3b57aaefe6c76aeb4577 SHA-256: e147b5e69177daed5ac5e8ff29476246a125a4cbe1c63309d6fcafee6d7fc170
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious and contains numerous embedded URLs, many of which are part of a link farm on disposable hosting. One prominent URL, garglob.ru, is used in conjunction with a UTM term suggesting a lure for an 'instagram mod app download'. The presence of multiple external URIs and the link farm structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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://garglob.ru/uplcv?utm_term=instagram+mod+app+download PDF link annotation
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/fupotejotavikejewe.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/batesuwezasinupapoxirowol.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/69372299381.pdfIn PDF document text
    • http://jfe.hk/userfiles/wetuxubetul.pdfIn PDF document text
    • http://ccsl.asia/files/93794173641.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/45906683678.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/96775378299.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/fezebelovatoxekudi.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/61013199719.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/fadopomabezupalip.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/4318173190.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/wugerigomilusenopo.pdfIn PDF document text
    • http://web5gstore.com/Files/files/wofatomezosevaziwuvovav.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/32744655553.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/8921620617.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/liriwoli.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/kozirifesuxekexugumatop.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/57289386112.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/11194859214.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/borupibizivenivafowegagil.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/rejigenigopape.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/nataziveravepunej.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_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 18248 bytes
SHA-256: e924b75ccaa4affe36ece8a0d1b2dadad2f96b4b1fb0512c5938587d8f5fe39e
font_01_sfnt_off00010abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D4 10548 bytes
SHA-256: ca3741736b475d19b126dbfa7f63647f277835887b68e947e17b179288de27ea

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