Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4b31b8c4391027…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 21:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17acd662df117bc44a58f833d79d6068 SHA-1: f9ce4c1f78b214948ce4a209da7e35bb853076f2 SHA-256: 0b4b31b8c439102792388d0743ecaa3d08027d9af811f9a45ff34e89880754cb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://garglob.ru/uplcv?utm_term=ppsspp+games+link+download PDF link annotation
    • http://sunwisechem.com/Uploadfiles/files/78627673623.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/62652039051.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/76211621370.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/35066545269.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/wamezokawumeperabawoxodu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ad4ec8a8fac2ac75d209321c440de9b0/83476617970.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/74854153876.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/67770462325.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/wotupotakovefogirutunexuk.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/mubitix.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/loxuriwumediwuzu.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/mumomof.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210908180526.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/30519753471.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/89654135914.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/61104711991.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca59b0a51---fuvakituxutojimawovude.pdfIn PDF document text
    • http://premo.at/userfiles/file/38342235275.pdfIn PDF document text
    • http://jawarakreasi.com/file/64258397893.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/84933496962.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/vujupunawipaxejor.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/39050521185.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/bakofutamutavopi.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_off0000d4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DB 17140 bytes
SHA-256: 9757efac037c3ebb51f2194c3f6bc5126b75e3c84a764a48d8c87913d11a5a92
font_01_sfnt_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11973 10716 bytes
SHA-256: 22ef553a9ab5abff6f8e34e4d6cd54e060394a2b8dab1cf8f088f31a7b7a4560

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