Malicious PDF — malware analysis report

Static analysis result for SHA-256 27001306c58aae0e…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 08:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c48fce6ab1750eff6277174892c1c142 SHA-1: 98bd0551283f9d39f1283830c1c1e5a5f6cfcbda SHA-256: 27001306c58aae0efa8e9b2aea482ecb24cbe83b67c1c7c9fc7d7d95d7323508
174 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, suggesting a lure to download a malicious payload. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://madiagranitosilano.it/userfiles/files/samakuxotumumi.pdf In PDF document text
    • http://zavalinka.by/var/upload/file/10737608838.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/vexowoparox.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410e09d3727---tetipewekago.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/woxemikasorukewuxofunin.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/manolurojuxapu.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/93312842929.pdfIn PDF document text
    • http://podarox.ru/public/files/10394552638.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/35284723428.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/pasedozusejumusukekegoxi.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/14420986253.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/gawal.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/81609625245.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/47340066667.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382aa703ba6---62327836259.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/80088903788.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/terebajexo.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/36287774433.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/5236703058.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/79500856968.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210911081106189.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/72409551974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=potty+racers+5+unblockedPDF 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_off0000ce55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE55 16632 bytes
SHA-256: 3749f2cc6e875c8eee12984f82caddd1a36704af5d61fe436a0af57c737ac57c
font_01_sfnt_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11147 10852 bytes
SHA-256: 25689b71ba1b954579b6b82bef83fa4284e81844a677b4830b6d6f8d9690d3c3