Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60525389a144509…

MALICIOUS

PDF

68.3 KB Created: 2021-10-02 11:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b66fed03e83a7f6275136290e47ba08c SHA-1: c49f0ad190583a391c7200c32f97c931662cd781 SHA-256: a60525389a14450961b7a1d3fd7bd652edbed7a565b37b5449b07776e45dbba7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it's an image-only document designed as a lure, containing numerous external links, many of which point to disposable domains. Embedded JavaScript was also detected, which could be used to facilitate malicious actions or redirect users to further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://benmoonpharma.com/userfiles/file/22401331609.pdf In PDF document text
    • https://belretail.by/ckfinder/userfiles/files/wenaletagurok.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/89578835521.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/nedaroked.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/25729786994.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/17569682736.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/2264316535.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/73605567426.pdfIn PDF document text
    • http://holzbau-napetschnig.at/80693202234.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/zemavevupi.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/7390952901.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/72802116461.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/93898415496.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210919181051.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/97652918781.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/najolepusupapi.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/35090687294.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/54391204437.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/37140204551.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/jovosamikinak.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/tufikijobubulekiw.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161379a92af990---11175270692.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/vixudexivapozajodufavelen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=most+insulting+namePDF 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_off0000b070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB070 10444 bytes
SHA-256: 0c16358756618852280a9300d6fe3a75dfacbc7feaee8c9bbe1a53a1eb7ddd18
font_01_sfnt_off0000c82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 14200 bytes
SHA-256: eb2a4364b39cef9b1dd6abd419195fc777dedf7556c22bf04e217d641461ccc0