Malicious PDF — malware analysis report

Static analysis result for SHA-256 170cfae73c678044…

MALICIOUS

PDF

77.0 KB Created: 2021-09-14 08:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c9935574d894de8df24796beaaa6ad88 SHA-1: be50e2c319b1b2fa035853adef4526ab9336de21 SHA-256: 170cfae73c678044d1d11b3ffbf968d48e6a0a78ca471d41218dde3dd0251951
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file is classified as malicious and exhibits characteristics of a phishing lure, specifically targeting multi-factor authentication or one-time codes. It contains numerous links to external resources, many of which are hosted on disposable domains, suggesting an attempt to distribute further malicious content or harvest credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://pixomot.ru/uplcv?utm_term=free+indian+movie+app PDF link annotation
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/32571880355.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/jiboxodutafa.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/takakapakoditolasavi.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/vomebitimidoxaz.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/raluf.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/limebo.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/80495121416.pdfIn PDF document text
    • http://gardatrans.com/content/Files/43761947986.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/31567585634.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/56402368061.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/7447475753.pdfIn PDF document text
    • https://buyafranchise.org/files/files/fakalegogiv.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/matikaboreg.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/49121665552.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/mevukomezijagadegarisepe.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614006a6e73d7---bopemevujunamesaj.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/79376665586.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109140133444168.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/62432452362.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/67125411801.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/57085697456.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/22989426525.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_off0000cb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB00 10284 bytes
SHA-256: 60fa4b549317f946dfba26d7daf711a1905a11346ff53fbd66e25f822b3bada1
font_01_sfnt_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 17236 bytes
SHA-256: 4cada363532c03c701a6dde06edeec294dddc6caf11677e96e332071dab27bcc
font_02_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1