Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f1558aaaf7d6b7…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 13:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0f06c72e54ac1c8258eacb58cdb2ce7 SHA-1: 92b2661a418fc2bade6f406cfb40d1192e63ccd6 SHA-256: 12f1558aaaf7d6b741beb22dbf300abc76bd9a92a298e3e2c6a421feab6f1ea7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests these links are intended to direct users to potentially malicious or phishing sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://infrive.ru/uplcv?utm_term=the+basic+rules+of+basketball PDF link annotation
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/60432009866.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/46213803907.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/fe0a8518f0d0743f8232459cfd5c5023/limamo.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/48812947810.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210919130726.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/56260482927.pdfIn PDF document text
    • http://bandwidth.aryanpalace.com/userfiles/file/sagivobovu.pdfIn PDF document text
    • https://fasaac.org/temp/files/kalarejow.pdfIn PDF document text
    • https://subded.org/userfiles/file/7627156675.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/wanobekesarumegusa.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/xepupijilanesegupejorino.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/titefatolemowonoda.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/mopaxodaza.pdfIn PDF document text
    • http://consade.com/userfiles/file/jilelinemizidodazurega.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/76119449101.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/21093792137.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/41357779088.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/xodujafi.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/86650529470.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/xejulijivobukoxefad.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/7390952901.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021912749208800.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/64524614178.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/32403975074.pdfIn PDF document text
    • https://activepymes.com/pub/file/33811317357.pdfIn PDF document text
    • https://sainaudit.mn/File/26238038082.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_off0000c4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F5 16480 bytes
SHA-256: 31f046cccbd85550d3c5eefe18bf60095e9d0c61b9704f9ddf8323f7cf1b3b50
font_01_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 10624 bytes
SHA-256: c7272d5e6d14b8479b48c55201c31547819f6f05ec11c8f18b2ebd46088c78da