Malicious PDF — malware analysis report

Static analysis result for SHA-256 af076df1a1e3444a…

MALICIOUS

PDF

72.2 KB Created: 2021-09-14 11:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1890e09353036b484053e76838f4ce46 SHA-1: 9442f1054a3154accde0341bbb3c0655fc1a14c7 SHA-256: af076df1a1e3444ae1fec423678a66c020cfef28cb4c898f59e592b96d1cb29e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious files, and heuristic analysis identified it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ginecologmuresan.ro/ckfinder/userfiles/files/96774808821.pdf In PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/27910076128.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/xamebawusubufakapaxo.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/8477br7nk38es7jgia04o29lt6/10596369880.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/1684997155.pdfIn PDF document text
    • http://chikatere.com/Upload/files/pamixaxu.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/gobuvusagukadewisa.pdfIn PDF document text
    • https://okazionche.com/files/xiperulaxulokoxixuwumu.pdfIn PDF document text
    • http://xfswchem.com/upload/files/53705416947.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1e978a69fe960b5818004bbf7924ca4a/suxumutozexafovumi.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210903054720.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/jawabidugot.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/43198982666.pdfIn PDF document text
    • http://hflchw.com/upload/file/86855043922.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/35925254937.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/bepapifezegasopololaj.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/87897495993.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/wosokafuzimopubenagaso.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jepegak.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/wupasifulitulalamawufo.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/gozisufez.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/28193567578.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/60374983010.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210912_6C39967583CF2C01.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mega+evolution+gba+romPDF 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_off0000b78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78B 10584 bytes
SHA-256: 433e3339e4f61de0eb9ffad4eb7b74e0c7f89b4becb10fd88132ed55232de984
font_01_sfnt_off0000cfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 16952 bytes
SHA-256: ccbe846156ee1a2f6de9feab1306cfebd1db5c7eb9578291d1c63ba767191139