Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c86b659cc037fd9…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 16:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24d276718e86874a31776e11162aebb4 SHA-1: e35b69c033953898708e33e6eddb19767abe7b8d SHA-256: 0c86b659cc037fd90d9cda003c9051a2021d425fdda162b5a1185970de50cefb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of numerous external URIs and a link farm structure suggests a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic further supports a phishing pretext, likely aiming to trick users into visiting malicious links or engaging with fraudulent services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=terraria+cheats+android PDF link annotation
    • https://terminarz.online/kosmetyczka/krakow/files/5792739290.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/44626292923.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/rezowebopasude.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/jutap.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/4564131903.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/1495069766.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/27749890090.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/gexifikoxatobup.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/saseju.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/901343384536251e9c41bddb3ca16da6.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/161412ef5b8f10---jirozisijinewogexaxizojes.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/86010547198.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210917_121820.pdfIn PDF document text
    • http://perksys.com/userfiles/file/jilamana.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/6372463959.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/fakalifonuwamibom.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/pakepotoripeza.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/roxojowatugidabop.pdfIn PDF document text
    • https://netpage.info/userfiles/file/dijejomixuduliwalixi.pdfIn PDF document text
    • https://norservis.cz/files/files/lomamujexa.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/65872562637.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/rerena.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/94960348094.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161440f6fb6764---vewifumuj.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_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 18068 bytes
SHA-256: f9b6948ba3709b41003796c5e67a863471d8e99ae2f5874fe339318454c8ae12
font_01_sfnt_off000100ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 10384 bytes
SHA-256: 34851404bd277143474f5802232ecd8ee5ff0909d58ee52ef80bb1c82b8fcf7b
font_02_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1