Malicious PDF — malware analysis report

Static analysis result for SHA-256 287f37a04774a734…

MALICIOUS

PDF

85.4 KB Created: 2021-02-18 04:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a38c923a56102531837298fb547d9e86 SHA-1: e48e85e66c64a7b46dbd049ae6005db7d1bcba47 SHA-256: 287f37a04774a7340a8acc04aa2123f444e07b8584a0a9dae5da43cbd1d2585a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=roku+3920x+setup PDF link annotation
    • https://cdn.sqhk.co/vawadawuleja/egjVifm/earn_to_die_2012_part_2_unblocked.pdfIn PDF document text
    • https://xobopeta.weebly.com/uploads/1/3/0/7/130739243/4721c40f59da.pdfIn PDF document text
    • http://vinnipoh.fun/application_definition_black_law_dictionaryg5cky.pdfIn PDF document text
    • https://fozivumi.weebly.com/uploads/1/3/4/7/134761275/8130713.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxifopu/hheieTw/realflight_mobile_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/cUgdihe/copper_alchemy_symbol_tattoo_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/jtKpLgF/city_of_warren_water_shut_off.pdfIn PDF document text
    • http://getallcreditscores.info/conjunction_and_but_worksheets_for_grade_2srjt1.pdfIn PDF document text
    • http://solapp.xyz/34822131477dwvtl.pdfIn PDF document text
    • https://tunawirivam.weebly.com/uploads/1/3/1/4/131437064/bolemuk-debelixisad-mixoz-zigeji.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/rogabatufoxi4l8.pdfIn PDF document text
    • https://tejojapifofomo.weebly.com/uploads/1/3/4/3/134339563/vupazeduropitu-nopetolum-vukeg-jofola.pdfIn PDF document text
    • https://cdn.sqhk.co/bavimimo/rBia8LX/download_bios_epsxe_for_android_gratis.pdfIn PDF document text
    • http://luminar2-download.xyz/16284560318gplsa.pdfIn PDF document text
    • http://natural-shop.info/topizy0luf.pdfIn PDF document text
    • http://teasmall.space/vafuponupir6hm6a.pdfIn PDF document text
    • http://1ux.site/45608039302m19ey.pdfIn PDF document text
    • https://vojerured.weebly.com/uploads/1/3/3/9/133999986/7330206.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 5208 bytes
SHA-256: 6acfe700bf5bc73239f67605ccd0c7a1ee1de8835f2053035e89b7c056a9d6a4
font_01_sfnt_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 1936 bytes
SHA-256: 246569b5fd7226bd0ebf3c016de7ba0bf82e996896d660a08030b2af0a08efd3
font_02_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 10592 bytes
SHA-256: 05bef956ce7e52f79e91e36f340aecc3a3d40a9b3beb0acff65a01c70ab8b9cd
font_03_sfnt_off000132a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A7 16080 bytes
SHA-256: 4862f0796d5cbf2b429715f2b47f15d06f0c641f927a022d27f217f4f39910ad