Malicious PDF — malware analysis report

Static analysis result for SHA-256 010f7dd3916c90d0…

MALICIOUS

PDF

72.3 KB Created: 2021-09-13 02:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a9c090d18206c7b9cc2bbc0eb34e066e SHA-1: 70c725f7fdb012af307e49607d3f2baea62bc51d SHA-256: 010f7dd3916c90d0966e2b6bc079f7a611624bb5c017abf99c016f171091e4eb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm designed to obscure malicious destinations. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the 'download button' heuristic further support the conclusion that the document is designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=9th+maths+book+2020 PDF link annotation
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb4731afd1---tikojonog.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/51430204614.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/mifobovojep.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/46297025831.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/53009957748.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/mikesofebi.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/takubepubavepowozaze.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/fufafesafisomad.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/tegigukokov.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/bojavo.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/39740920999.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/kagumivo.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/terovogupifewiban.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/fugoteruj.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f7794fe972ee93204b4f45f88286ff43/nesemoje.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/lilirez.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/31995712412.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090720485543.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/14096013800.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/1452316333.pdfIn PDF document text
    • https://arerp.kr/data/file///97874730255.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/93213740133.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_off0000ba12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA12 10444 bytes
SHA-256: d9dc36e27b13399abee607cac5f26632bcbd3224823b6b7abe5524442919e648
font_01_sfnt_off0000d1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DE 16424 bytes
SHA-256: f6b588dbbbb12ec5dab441e4f39692fbde88422f5a3a9ce613bc4229bce83e6d
font_02_sfnt_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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