Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e6666de2a328eb…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 10:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f97c4116c0d7df5573a9d0ae16542285 SHA-1: aa410181255fca71b6fc58602ad662f8071446c3 SHA-256: a6e6666de2a328eb475c3a028e87e92a47aeeaa701a9bef85b91cd1b8ac2f169
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. The embedded URLs, though many are marked benign, point to suspicious domains that are likely part of this link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://xn--jt2b56wn0ap2a.com/upload/file/202109250007545961.pdf In PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/62ed99009df1231df806c7d19e23482e/zupelet.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/tojufakuw.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/39165177707.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/taxamasatudiw.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/xonorazakenerelesirovib.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/kixigilixavugobitomiwam.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109130129232406.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/wevurufidisilejuvase.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/74951508571.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/zoganavudome.pdfIn PDF document text
    • http://byecook.com/ckupload/files/86838615699.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/zerajimuzakoxif.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/32144107068.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/jixovotusegovebupamiseto.pdfIn PDF document text
    • http://bdnchem.com/upload/files/69861395209.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/makidiza.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/jixoguki.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/vofidonujopabejakadoxus.pdfIn PDF document text
    • http://vce34.ru/attachments/file/10298158259.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/somiwovokaje.pdfIn PDF document text
    • http://fygl.net/uploads/file/101058348446.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/92737214688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+messages+notifications+not+workingPDF 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_off0000b4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CB 17764 bytes
SHA-256: ca14ff0736c0db4c37f71d80c995fd02f4b01cf63d15ec2aba0e0addbc2a9524
font_01_sfnt_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 10932 bytes
SHA-256: d89dfb089b4d2e217df9956406dcf9c170c3b6f59a8c8672118cdf038ad662e5
font_02_sfnt_off0000fb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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