Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb045d0c01e0f89a…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 02:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 296c2cceea318e3bf72b9cf0d408636f SHA-1: 8da9751e9f7bf19b030ffee914ef14dec2d4beb1 SHA-256: fb045d0c01e0f89a1ba88e0c0003863473bff77bb9ed7a2c7b01ad46df83edf7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document as a link farm on disposable hosting, reinforcing the malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=how+to+hide+a+photo+album+on+android PDF link annotation
    • http://erpos.sk/data/files/ruxenuneruso.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/zowoguw.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/vinuxatasujufekizixoz.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/lezevogat.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/42317954924.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/16481189054.pdfIn PDF document text
    • http://ctm.it/userfiles/file/movukufivibigukivam.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/59867933640.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/jurumatep.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/72b3f8bfbbf4bdd7d7810369d4360329/29352617324.pdfIn PDF document text
    • https://highrise.pl/file/pivebulu.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/wezojalufipa.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/3248697587.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/98957530102.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/966b9e5f3ab08266025b44f3b09cd78c/68090637463.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/bemanusiluxesadofif.pdfIn PDF document text
    • http://snft.ro/media/file/jidadako.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/28061922169.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/senowodaturuwom.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/pazewujomo.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/82444707710.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/sedimej.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_off0000af4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4B 10808 bytes
SHA-256: f410021e45a6abddf820da7f94b8120efe5ffcf28c248570d1275509bdf3dfcb
font_01_sfnt_off0000c7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 14764 bytes
SHA-256: 2889af5c8f893265112045ae363e8d5f15acc46d9af843d0d0df48c912bdda4f

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