Malicious PDF — malware analysis report

Static analysis result for SHA-256 2751a0b144b3fe76…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 02:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 992904a6fa22060af6266f9d62bf5afe SHA-1: dbad45870283c6d1ed30c2204afccf9cd8e21702 SHA-256: 2751a0b144b3fe76f7fbd16793a45fa59cb2b0c783a3851c4668b7f4697f5cc8
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains or appear to be part of a link farm, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=mugen+train+online+free PDF link annotation
    • http://rideabikenews.com/user_img/files/26204086419.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/68706468947.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3ctknu27krtmp7ph3cnemrqdbb/3915126951.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/riporifenenumewo.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/zawolosuli.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/36427960810.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/lomupaxakuxige.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/xuzoz.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/53698475083.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ac6241f42553f4b077c55d012d10167f/jijekijesulogamutanego.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/jodasenibe.pdfIn PDF document text
    • http://sireny.net/share/files/94933083435.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/busafafixevuvamo.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/39875219319.pdfIn PDF document text
    • http://airzo.net/userData/board/file/40017795140.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/88619208411.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///24986399966.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/volap.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/1261216411.pdfIn PDF document text
    • http://marketingnews.fr/images/file/mofovaligufiberibu.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/53872217570.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/98228168947.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///14078195276.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/31635104366.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_off0000d3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 10316 bytes
SHA-256: fbb67839f426f511ebba6d25412ba3e7ba7986045cd0dc572bdecb45aec2880a
font_01_sfnt_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 17480 bytes
SHA-256: 40b3ce3c6f7c05e87a6e501fec8f10b5561a55edffce7326d3be7bba10372eba
font_02_sfnt_off0001189d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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