Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcc58e0bf9b2dd8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 08:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c94eb242238ba081ae679a2c05f6303 SHA-1: 9051378b39b41c2acacde760d0557f8e16e9732e SHA-256: bbcc58e0bf9b2dd8524f158291b7d4b4eba20d41c8f937635bab6ad5d055f384
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a delivery mechanism for malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=comment+rooter+son+telephone+android+avec+pc PDF link annotation
    • https://detectagsafety.com/ckfinder/userfiles/files/37182680538.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/zanogatexizitu.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/50655312532.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/8957699682.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/sibadefilu.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210912200615.pdfIn PDF document text
    • http://hongdacable.com/d/files/91487932244.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210909191735856002pw7ra.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/wewozukojiw.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4b118af82da781a43e1979a478469704/kabezarojiwumelojevola.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/tatefulokumufupo.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/laluf.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/zamejojusutazim.pdfIn PDF document text
    • http://boldogelet.hu/media/54864257452.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/foxuji.pdfIn PDF document text
    • https://solturism.ro/images/file/9554842347.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/7577439474.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/nobaxejo.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210901125332.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/sodadavufe.pdfIn PDF document text
    • https://kermanrooz.com/img/files/tifilowafurufesalisaziwe.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/pikotakivezefajin.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210903011947.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/87718499860.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/66822190208.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_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 18964 bytes
SHA-256: bb34350f7ae2784ea8764913368cb2cf526017fc4de68e3ab591a74a7702f1dc
font_02_sfnt_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 10876 bytes
SHA-256: 515e863c84871e5325e05a2d0f54c7eb5f229b6e956f9e40b84ccf4c1d50c4e0