Malicious PDF — malware analysis report

Static analysis result for SHA-256 59278bf6f7786734…

MALICIOUS

PDF

117.5 KB Created: 2021-03-18 11:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 81e5d1728bc68897fcbc5db4d48bdf03 SHA-1: c299086b3a938aab721d406f2678b2a156b6896f SHA-256: 59278bf6f778673424ccefe038bad29b99a886c7251e9b0fc25e10d4c03a1c48
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with a critical heuristic firing for a link farm and a high heuristic for an SEO redirector. The primary malicious URL identified is 'https://baarspo.ru/123?utm_term=pink+bollworm+life+cycle+pdf', which is likely used to host a phishing page or distribute further malware. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to exploit vulnerabilities or redirect users to malicious content, aligning with phishing and client execution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/123?utm_term=pink+bollworm+life+cycle+pdf PDF link annotation
    • http://sowoxapexemex.sportsontheweb.net/calendario_maya_haab.pdfIn PDF document text
    • https://xanikijopido.weebly.com/uploads/1/3/4/7/134738407/weraniwavok.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/bimizev.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/deporte_aerobico_y_anaerobico.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/791190.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/apostila_auditor_fiscal_da_receita_federal_download_gratis.pdfIn PDF document text
    • https://pesenulowujef.weebly.com/uploads/1/3/5/3/135325158/nevozeroluvorabodi.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/tumasun/animation_wallpaper_free_for_pc.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_c18d2b1f693e4961ac0c884103e55821.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/amity_university_lucknow_form_login.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/babli_badmaash_song_mr_jatt.pdfIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_e1b460844ea64104a374588023d6caaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/poresi/woporugakobeduwuwaboj.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/basketball_games_offline_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/3133642259.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/marques_de_sade_justine_1969_pelicula_completa_en_espaol_latino.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/98248477047.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/change_your_thinking_change_your_life.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/how_to_setup_epson_artisan_835_wireless_printing.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/business_growth_plan_template.pdfIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_db8e1f82dbc04380b45207fc1d824b77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xurixado/dubuvedo.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/jadisereburarosomiga.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_off0001747a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1747A 5312 bytes
SHA-256: 2a3ed3f97c57df2a696cd88a4d5a31b54b7fcd46fb9aaf2b978ffc1d97ed4004
font_01_sfnt_off00018692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18692 14888 bytes
SHA-256: ed40b494b5334bf9489b68d3ddf39f83a357bfc274271aecfdc178c0e3314f15
font_02_sfnt_off0001b2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2F8 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15