Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6a76499d8dcbf4…

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 20:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f10a8c0d38616cafcb2bdc2cf3c6617 SHA-1: 5b6ba38e08d8ac2cc0be2b2d3e621dff91a28beb SHA-256: ba6a76499d8dcbf44c2e98ddddd93fbf6a2b645b972a229ff135e81cb8077ed5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to various domains, suggesting it acts as a link farm or redirection mechanism to deliver a payload. The presence of a raw IP address in one of the URIs further increases suspicion. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=psiphon+vpn+android+download PDF link annotation
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/riwaxazaxolodifopi.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/56315413709.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/roverezodisebakaludezojol.pdfIn PDF document text
    • https://svltv.in/userfiles/files/71680203510.pdfIn PDF document text
    • http://goldmustang.ru/files/files/37047987569.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///11613510874.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210924_E33526106F0AD39E.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140767b2236a---8306487071.pdfIn PDF document text
    • http://stl-hk.net/userfiles/51265129330.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16140efb17d402---31898186675.pdfPDF link annotation
    • https://rowadalbyt.com/userfiles/files/79597379555.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/xoxebiwul.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff4e23d94---99303141170.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/3795612404.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/mudefi.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/10124861710.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/71395965497.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/nizasubumibar.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/kasivumefanolijarul.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/gojevaripepizubidiwuzo.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/varodofibofukumapiwugogof.pdfIn PDF document text
    • http://kaies.net/upfiles/file/fuxexototomi.pdfIn PDF document text
    • http://lawngo.net/fckfiles/26448593367.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_off0000b2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F0 10412 bytes
SHA-256: 3fbaa1c13ce9e62c463509804637ed4a83171d107b7f8e2db17d3b7f8d058d68
font_01_sfnt_off0000ca70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA70 17884 bytes
SHA-256: ad089cd243ba31b42aa67a90fab07beaf90d902b6880282f246c49196b712f4a
font_02_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1