Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bddf9db160cd1db…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 23:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 619acf9636782ed3bcefcf648ff0940a SHA-1: 1960536a752e96d9e0db129fa116655d06f1699b SHA-256: 8bddf9db160cd1db1557034cdc26ae02edbe3a564d97c2959f929608427c2e67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://coretry.ru/uplcv?utm_term=ghd+sports+download+for+ios PDF link annotation
    • http://svaz-podnikani.cz/files/file/91208916283.pdfIn PDF document text
    • https://dernek.daynexdemo.tk/upload/ckfinder/files/54154910527.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/11144663241.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136294db5af6---dezob.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/54443864477.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/fesipogekozodufowexivuz.pdfIn PDF document text
    • http://homeopathyhk.com/files/45916666793.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/40635821060.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/negumop.pdfIn PDF document text
    • http://fteq.ru/files/file/59322684590.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/melazawamu.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/75297412381.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/makawajofunisebeti.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/koxuguvuvalirovep.pdfIn PDF document text
    • https://mehregancenter.ir/images/upload/files/wularimazuzaf.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/xetebufiliv.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/16405620381.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lvd7l1r63g2bbuh1fdqo7vbttv/57354209465.pdfIn PDF document text
    • http://hotechike.com/files/files/sowulumaxefilulowedape.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/xiwozujafikitufe.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/16706874473.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/13761137569.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/79269974943.pdfIn PDF document text
    • https://signika.pl/Upload/file/2951904944.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_off0000b122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB122 15172 bytes
SHA-256: 0aad1050463bf86d17a934512f84ce52ed2be55579091632c9e31cb047e5d799
font_01_sfnt_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 10588 bytes
SHA-256: 0eca8f648fcea9673eccdc9b6446c1222922e3811d807669011302473bc1111a
font_02_sfnt_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.