Malicious PDF — malware analysis report

Static analysis result for SHA-256 a183e49271e85cc7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 15:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2755025f63923577863e16cda177d8c SHA-1: a2bfc12707db132f65962110ade5b3b32380c136 SHA-256: a183e49271e85cc75902887e4a23eccc68dd901b881f5e1bc2a64293765959bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=best+app+for+android+to+hack+wifi+password PDF link annotation
    • https://stef-nancy.fr/upload/document/24073036870.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/88661979597.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/99697524385.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/17836801973.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/24222591687.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/judugodoruvepag.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/96594783648.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/70319210574.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/44719556659.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/0d13e98ccd01a0ce35804a80bfb929f9/62454347392.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/85331077665.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/17268018225.pdfIn PDF document text
    • http://secoinblock.com/upload/files/domezizibagonixejuvi.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/xafusisugoder.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/nixefubedagumoripelumul.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/nonijabagevenuxoj.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/kabefu.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/26415727427.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/dezamidepuzane.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/xulumizena.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109161159513861.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/pumotiwomavibemaforene.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/9196214245.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308beb1ecef---wogetapejexogukabilimela.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_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 17036 bytes
SHA-256: 79039a1295f09fff9583cd76f337e61f60f1e5e5eb63b7c821a4d6a01faa31b7
font_01_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12024 10904 bytes
SHA-256: 2af41b77eb27b9445e0a45b2ae730c0d164d323d10e0bde0b544acd8b52cfc99

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