Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca788f7048dad4f…

MALICIOUS

PDF

89.1 KB Created: 2021-09-16 01:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 34ecf728c5b314fecc9f04079a66f29a SHA-1: 4f8e6bcb3274c225fc702b8390387a29cc324599 SHA-256: 7ca788f7048dad4f58e7742f141cf68165a2987e4edda1729c47b09114f922d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity, likely involving JavaScript for exploitation or redirection.

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://farashimirooz.com/files/15355321656.pdf In PDF document text
    • http://qianxish.com/ckfind_image/files/vexudagovepapenesoruz.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/77883358215.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/80419060675.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/vozudebamigowog.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/47648362440.pdfIn PDF document text
    • http://theponghop.com/upload/files/38268866705.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/7974580958.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/87444247133.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/72249391056.pdfIn PDF document text
    • http://csn-alliance.com/data/files/8707075085.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/sogikofizatevokoriza.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/nopixa.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402a187de38---titosibutinekax.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/37304100760.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/45414208271.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/nivufunumigaxij.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/98385509273.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/kudugijixekarufuxeza.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/fekutipunidu.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/22562124926.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090714150873499.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161426b0d083d7---16586394878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=good+movies+to+watch+on+123moviesPDF 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_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 17596 bytes
SHA-256: dad10863188cee29ee3b9834c7d818f1813342f94bf006a818cc267b22a1d2c9
font_01_sfnt_off000124dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 11024 bytes
SHA-256: eb7ceb52727980be04e7dc5d44b3c9b1102ddb8168f6456af7172e1e2182993d
font_02_sfnt_off00013e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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