Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc2ac7274e8fb72…

MALICIOUS

PDF

76.0 KB Created: 2021-09-11 15:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c70f9ecb24f4e63221348642514f4bb SHA-1: ba0a84eeff7264dd277a5de97d53c0009aae1a55 SHA-256: 4bc2ac7274e8fb7212426d5f670a03ca8e1300c19a7e2d0e1f4c8ff3aa6a0e14
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous links to external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. One high-severity heuristic indicates a PDF link to an algorithmically-generated URL, suggesting an attempt to obscure malicious destinations. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=fire+hd+8+plus+custom+rom PDF link annotation
    • https://viadagio.be/userfiles/file/wufuwepodu.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/luwijixosipalilapoxazopow.pdfIn PDF document text
    • https://5uempat.com/contents/files/12026758138.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/ladobosodokatezivum.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/27329388516.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/zuloratumodixamuwiza.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/569660470.pdfIn PDF document text
    • https://mlspoland.co/files/file/29530931852.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/ruzudifozig.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613568b9d34fc---21858203448.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/94655522572.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/45720616149.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/27511749909.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/82422803218.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132872295b5e---sezotuzumigibabojebujatav.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/19223149245.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/24436034694.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16308206915188.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/bazajofobuzegemizeged.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/dizekivite.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/34198507803.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/88303989036.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9b8f220e---lewajoxug.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/benibuwegesufi.pdfIn PDF document text
    • http://www.andreapondika.cz/file/98846755539.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_off0000c2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 17660 bytes
SHA-256: 0de5af069c1f9c572825c16f47c4a499771e02fdef1e9e8aa5b16e30b212d9a0
font_02_sfnt_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 10796 bytes
SHA-256: b5afc6929ac8be0305f7203699a14d1f3cdf4bcdb5df8ccef5954b2fc34d26fe

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