Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9bbf4919839651…

MALICIOUS

PDF

88.4 KB Created: 2021-09-20 00:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c166e8b91c49e68a53badc147c0aa22 SHA-1: b4d02b501c8128a81536afee6d30ed0c36c9a9e8 SHA-256: 4b9bbf49198396514914da46412597396fb81e09479595950963d8e79d0ef505
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript and multiple links to external PDFs hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to host malicious content. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=ps2+smart+apk PDF link annotation
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630749801/files/88678918293.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/35375143673.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/fatudulujasidagope.pdfIn PDF document text
    • http://heizler.hu/files/file/41946408939.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/26974769853.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/43647769421.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/86534745212.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/93889651464.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/geposolelijugawez.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/52933971754.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/67890206797.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/28313540562.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/75597193964.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/rapizozoxebatofuligax.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/89752437694.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/77551739481.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a96d3b6455---laparisesamatigowade.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/15017777817.pdfIn PDF document text
    • http://kag.fr/userfiles/file/lomitiwuzabadifebawazu.pdfIn PDF document text
    • https://kristinanamaste.eu/files/29795541719.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9aa65d1e338a7ff2795eb18d2bffeaf/nujak.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/69769046605.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/romufelinilifevokafa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C2 21280 bytes
SHA-256: e99bf8d2d458c8d7794b0688b3e8304e905f449b0f9c65867bde37644a3c7384
font_01_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 10132 bytes
SHA-256: f4b1d7fda37eb25e516ba3ef743c1aa9fb4002a8f889027e8a511a4f1655ddca
font_02_sfnt_off00011ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000136b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B4 18136 bytes
SHA-256: 8564e2b5b91338d0a71f7ec0d29089d79cba09b479265baec6346bc86e0c7698