Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4ec876c4758e09…

MALICIOUS

PDF

79.9 KB Created: 2021-10-12 11:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a9c52336d55cd07257103e6aa0f2bf24 SHA-1: 1aa66f005a02158bfbceb68bdec99a128b814a0b SHA-256: 7f4ec876c4758e0926fa8dee0c6c1d1b22a0194b5e665fa1a7345def03871c55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=endress+hauser+level+switch+manual PDF link annotation
    • http://xy-interior.com/uploads/files/202109041505293359.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/fuxebix.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/414cn7jmanisu83tcg1b5fnj6t/63534923951.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/texixubosa.pdfIn PDF document text
    • https://fratellifurloni.it/file/24208220711.pdfIn PDF document text
    • https://onecre.com/images/content/files/bijuzigagebove.pdfIn PDF document text
    • http://hasyo.net/files/file/julojubofexiwedigavirujif.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/816748005.pdfIn PDF document text
    • http://birdwatching.sk/media/file/zuzowosipugomo.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/jibuwuwojililar.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/mexasutamanomabetogonawim.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/65191698314.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/17194248532.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210911085445.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/51122033981.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/82518671135.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/sixevaridexizeje.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/60727454013.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210918_84834D22C3FD54DE.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/basavajizubudakilib.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/82964109034.pdfIn PDF document text
    • http://xn--c1adbeke4asdefy.xn--p1ai/ckfinder/userfiles/files/begerevelimadoguxagavix.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/lapukudop.pdfIn PDF document text
    • http://wohntraumgmbh.at/dosomod.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_off0000cc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC70 19276 bytes
SHA-256: 221e003d5641b1471be9c678af6a798e3363a3f72bd89d67d34136548ca637aa
font_01_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 10752 bytes
SHA-256: 4db17b5750c3a3981a71c7e43b4509190ee1e60f1b5661f5235a7c03d47164a7
font_02_sfnt_off00011849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1