Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b3af8394674bf2…

MALICIOUS

PDF

82.4 KB Created: 2021-04-08 09:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a1b460bfa2d4eabba1cd76f8cf53abee SHA-1: 03c4a6e9df9564207f5aa738150a42ccdcafe830 SHA-256: 22b3af8394674bf204475fb6ccab44b7968db0cc4bbccf18f7c1f59f1f0db254
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains associated with link farms or potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. While no scripts were explicitly extracted, the structure and heuristics suggest the PDF is designed to redirect users to a network of sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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://vilenefex.ru/123?utm_term=graph+exponential+function+worksheet PDF link annotation
    • https://cdn.sqhk.co/gorubabor/apt6T5C/1487952619.pdfIn PDF document text
    • https://cdn.sqhk.co/juvadujud/ifHhjAi/segipabenizabupejexika.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/cYjjJhg/.pdfIn PDF document text
    • http://reduslim-officialsite.site/32598819189qo4j1.pdfIn PDF document text
    • http://obuv-kozha.ru/hillsborough_county_back_to_school_2021ij9wk.pdfIn PDF document text
    • https://tedogiji.weebly.com/uploads/1/3/0/7/130775371/4989074.pdfIn PDF document text
    • https://pesirirovozag.weebly.com/uploads/1/3/4/3/134316115/pidevog.pdfIn PDF document text
    • http://gallery-shop.site/lather_and_nothing_else_which_statement_best_expresses_the_main_theme_of_the_short_story4pgt2.pdfIn PDF document text
    • https://cdn.sqhk.co/gopilufifeda/ftVrhj0/rebuilding_paradise_where_to_stream.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/wovudojemu/9PeBggJ/likefoxinesiwi.pdfIn PDF document text
    • https://sodejokare.weebly.com/uploads/1/3/4/3/134349501/125fc7e9d475c0.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/vigerinol.pdfIn PDF document text
    • http://dmgameplan.com/mosufokuduripy5c7h.pdfIn PDF document text
    • http://byseles.xyz/how_to_unlock_bully_dog_gt_gas_tunerq2ikf.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/joomla_kunena_templates_freeg8wbu.pdfIn PDF document text
    • https://gugibutuxu.weebly.com/uploads/1/3/2/8/132814167/kemepidese_disarov_tebekogeramog_befewegabofev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/52053895871.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/roland_td-4kp_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/remab.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/9194401919.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/leditijulolepofikefezimi.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/peter_thiel_pitch_deck_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/nifafexuxavemuvozaje.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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 5356 bytes
SHA-256: 51f583e999da7368c383fad8401397037a0ea674a30a4c0eef90466f79f5e2da
font_01_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 12616 bytes
SHA-256: cbbe30708a4d606967c23fad543016ddf8b79bdf21320e84171f82aa2f530df2
font_02_sfnt_off00012541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12541 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833