Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1a889e19cc6b71…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 03:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9b9827a376eac24ab4a6ac283af13b5 SHA-1: bda416614b0eb913d9effb7bb5b4375bb40911f5 SHA-256: 0b1a889e19cc6b7174fc397ca7b70163c25831e5a0747a3c22eaf53ced2635eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'inwebjor.ru', suggesting it functions as a lure to external malicious sites. The PDF structure and the presence of embedded links indicate it is likely used in a phishing campaign, possibly as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=tracker+spy+apk PDF link annotation
    • http://ateliergermain.org/sites/default/files/file/86938071858.pdfIn PDF document text
    • http://matras-devison.com/upload/file/monipemirezeselotinazus.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/nuwitunipusisu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/40768433b67b4b59af7616c2d4743506/20105855537.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/156756771613633d7e61d6.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/zofawe.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/pevufodulenavovi.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/83369446832.pdfIn PDF document text
    • http://platcometals.com/images/file/6651682952.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/venof.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/sogode.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/topev.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/76166577190.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/datakubizu.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/92566900436.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/84128181183.pdfIn PDF document text
    • https://termofriz.rs/files/lujevovigazimelarofotutix.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/vefon.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/raduporipirujuwozomamif.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/sexutabiwonozujozu.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/93489452145.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021961748289578.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/61488998908.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342b2b666a3---xavonogumifixuzibifepa.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/vakapi.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_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 10076 bytes
SHA-256: 1bd3a55dd0834e5d1e98fe19bb2345907775fcaac0957f395c9bbb559407c8cf
font_01_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 18164 bytes
SHA-256: 02183afbc3d06540c3470287bd73ff6535ab93fc558318a42a12b62880a056c9

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