Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41a4f964cd5ed03…

MALICIOUS

PDF

72.9 KB Created: 2021-09-20 10:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae3c895fbc1989e58b020ad90228e61c SHA-1: e710673b6bd5affc9e0e7476a3a700ac5b575f37 SHA-256: f41a4f964cd5ed037c3bc7f886b1015be6ef22434c543e9bc52b00625dff05ee
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The PDF contains numerous links to external websites, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the structure and numerous external links point towards an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/241f0237bae1b0a61329654d712424ac/ganuwujaralatenarus.pdf In PDF document text
    • https://mmoxx.mn/userfiles/files/dopobobenosewirokekowim.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-10/20210910223441287919.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/fekunonisudubepezewitew.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/58330847375.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/veridadoxajanuloni.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bunowukirupodi.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/10389971722.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/22602063375.pdfIn PDF document text
    • http://cbstav.cz/file/jatekulirabexolaviw.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/rurulazixotexiri.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/mirelunifuzul.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/82351345854.pdfIn PDF document text
    • http://inistor.com/ufiles/files/vedobupezato.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161447328319fd---vigipewodibigarulajuw.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/kezurexozalomikasuvorav.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/35989348904.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/74327957647.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/zenezewosap.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/turejufekonatavexi.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/8257624510.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/79045312293.pdfIn PDF document text
    • https://armenia4d.com/contents/files/56961242085.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/pedowalidobovigizese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=nintendo+ds+emulator+android+gamesPDF link annotation
    • 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_off0000baae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C0 16752 bytes
SHA-256: 7f0f8878a4d5d5bd02c659ab589546f0876b4fa40e8d4f14843e89a2712cdb2f
font_02_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 10668 bytes
SHA-256: 5cdc9f00638ae3fdbe11418728309c8b45e6a9b4b842566ec21978df18c88b54