Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f850777f89d6725…

MALICIOUS

PDF

84.0 KB Created: 2021-10-01 16:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 34c11ecdef7a01c6c16d246e6fb93e5c SHA-1: e2f161fefab3cddd933e06b58b8a0b36c9f36f2f SHA-256: 7f850777f89d6725c58e8642ac6a2b4b50718755a6ba57f96419f8485fd9e6fd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript points to potential exploitation of PDF vulnerabilities or redirection mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dalboncostruzioni.it/userfiles/files/pepatafajul.pdf In PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/bavegosukofaremiw.pdfIn PDF document text
    • https://ayurmitra.com/files/file/79495355334.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/jegajorumeba.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/dulovafizinut.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/79632123074.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/57994814499.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/26667611486.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/puzekofebimawuzumuture.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210906063732.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/vinifobija.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/zetugakuvolowogapev.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/koxobad.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/2918092626.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/29297167447.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/16847338800.pdfIn PDF document text
    • https://kultmotor.virtualbodybuilding.hu/images/files/bedominuge.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/tisimigovivedibobuzunowuf.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/tonejezopatibotenekupowa.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/43800399706.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/lajerikavutuguku.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/jowidapekodupazedexoguxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=manga+my+hero+academia+season+5PDF 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_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 10912 bytes
SHA-256: f15e29c491d3a18949bc1fb6fec56cebbd19ad0d51b4e63e1a7d4f10a51a5eb3
font_02_sfnt_off00010958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 21804 bytes
SHA-256: 727049a4be94f5bf78b30945438e909ced8008dc621b71d5e6d0d7cf2c6101f3

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