Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35d1ba8ede8c5f6…

MALICIOUS

PDF

88.3 KB Created: 2021-09-20 23:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1bb633e6607448e0feacc6422130a59 SHA-1: 604fac77f9c9660b4e445963c108e155146999f8 SHA-256: d35d1ba8ede8c5f61327a4ba9ae3ea1d7f61de8314f749f256516cba10326615
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and heuristic firings, such as PDF_SEO_DISPOSABLE_LINK_FARM, indicate a link farm designed to redirect users, likely to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=android+tablet+drucken+hp PDF link annotation
    • http://aimic.com/userfiles/file/19886354290.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/88688757468.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/zineriri.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/gizuwedorobijemifuse.pdfIn PDF document text
    • https://datajournonepal.org/files/89064578902.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/sekefolesapaxosufofaxefa.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/16635309158.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/30035094156.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/43502764153.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/83976896307.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/gidomekisavigined.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/fiwipigux.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021092008495723.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/gogozekikegegurawasulebo.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/weweje.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/75345642959.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5116bf8516069309abb8ff2735d9d1d6/47937504542.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/53190588119.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145df6368653---56573073095.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/pojupebetaridoxijeketu.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/fofagunepoga.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/17019709859.pdfIn PDF document text
    • http://korytnica.net/data/files/retilujepevame.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/rapubezumamoxaluvukesupi.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_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 10756 bytes
SHA-256: cf204529c42db728dd8f0597f02f4f6b7042cfbdbc85c67b3c8f8813271bb68a
font_01_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 19692 bytes
SHA-256: 867bd0260b06de71b1de09058d7a73027ad2586dd5d15706210e874d3ac7ce4f

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