Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64912b10f98406b…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 00:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4138e6081391483faa8b49fe9bb4e24 SHA-1: 2e9dce01ba0936a1ddf6f3ce79013229cc0fdf1b SHA-256: f64912b10f98406b05f80a29377578e98d8ff3aa5f9181f84f53aef055a424a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The presence of multiple unknown reputation URLs suggests an attempt to direct users to harmful sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://lnv-cnc.com/userfiles/file/10397243284.pdf In PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/sevukazowaketomaki.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/fifanet.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/89235917390.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147a60fa0ebe---81859643749.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/fetilopidabi.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/vavixanekuzuladuwa.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/62461755542.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/44278990280.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/3222588713.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/41115811704.pdfIn PDF document text
    • https://mfdesign.hu/files/file/29943422528.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/3ca06cc4df4a298ba8597f2037f5755a/fugobulufudokegukezaba.pdfIn PDF document text
    • http://skupka23.ru/upload/m/fakisimamiwimutul.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/sakinakesogekepumerezobu.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/nuwuwetexesewosinuxiruno.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/41324688068.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-5/20210905191001457030.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/nuferanarudikakumiro.pdfIn PDF document text
    • https://insp.biz/img/file/ketopifava.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/lesared.pdfIn PDF document text
    • http://heizler.hu/files/file/xivakige.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/6134651330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dulux+app+androidPDF link annotation
    • 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_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 17380 bytes
SHA-256: 28bc027d28b1e06ddf91b1b18335913a89d8b5bd4298f2952134c3d4d3dd3d2d
font_02_sfnt_off000132d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D6 10188 bytes
SHA-256: 79262b32d711db3c65a7af541a7717097903ad5cd29ae5450c9be3e5d84d3d22

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