Malicious PDF — malware analysis report

Static analysis result for SHA-256 325fbfd03f5d6a8a…

MALICIOUS

PDF

68.6 KB Created: 2021-10-09 13:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 9d76ba5315dcd9c987aa8d35bb88100b SHA-1: c504b14c0ba411306d8c72e723d9e59bd0101bbd SHA-256: 325fbfd03f5d6a8a14d202e1b173ba10bde07cc24bb9b0f013a38717ad771bc6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high number of external URIs strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://allytemp.ru/uplcv?utm_term=the+major+anion+in+body+fluids+is PDF link annotation
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/gilavetegagarimuvowafisib.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/kisesuj.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/28964265704.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/lupukifivaxexovewubodiv.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/ronajimunubixadobado.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/92540038584.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/zaxekis.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/89338412201.pdfIn PDF document text
    • http://ingore.cn/upload/files/88578659108.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/moxiteziwuguj.pdfIn PDF document text
    • http://magicfood-cn.com/files/20211006161426.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161525f3fc9a9f---12842772028.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/7092961712.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/nowerelo.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/30340934680.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/zotofedifowigorodu.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/pugevorolitajajanovubum.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/xeforidinarulixaviwupawor.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/rupopa.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/37514523879.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/72731134587.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_off0000b00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00F 14328 bytes
SHA-256: 3a61a2d8bbc07d85fdbaea42b47e2c3b2c63361b1f999c138aed605d560945a0
font_01_sfnt_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 10968 bytes
SHA-256: 83c542a53da82ba2e8e165c33673850748e394d5bf683cb99a121d6e822bb558

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