Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e7dc9c03575e37…

MALICIOUS

PDF

113.3 KB Created: 2021-03-12 19:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c67649cf58f9efba4c672d76c17b4c43 SHA-1: c67db3fa64e0c38fa905a44ce898b2654064a079 SHA-256: 40e7dc9c03575e3786aaed0bf76358abd8a773e8b13a21a5c7eb9ac121c47c30
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/123?utm_term=reema+bharti+ka+bhojpuri+video PDF link annotation
    • https://cdn.sqhk.co/bubiwalifeda/Hjaidtg/digi_remote_manager_login.pdfIn PDF document text
    • https://rezedutusijilik.weebly.com/uploads/1/3/2/7/132710703/1839765.pdfIn PDF document text
    • https://xaweregosakub.weebly.com/uploads/1/3/1/4/131407668/dutut.pdfIn PDF document text
    • http://silkhfig.bid/25703567343enmyq.pdfIn PDF document text
    • https://getesedalo.weebly.com/uploads/1/3/4/6/134629657/6994104.pdfIn PDF document text
    • http://hookup673.site/basic_full_form_related_computer578ih.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/G4gilgc/mibikumezedekojevog.pdfIn PDF document text
    • https://fuwodeku.weebly.com/uploads/1/3/6/0/136095673/4e99205da5a0012.pdfIn PDF document text
    • http://ibkreactiva2020.com/midea_mini_split_owners_manualvrwce.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/jLWhcjc/97103960006.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/jqjhgi1/lifovifodozuk.pdfIn PDF document text
    • http://bnl-jobs.com/sabrina_graphic_novel_downloadc0fcw.pdfIn PDF document text
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/244f17d1075da.pdfIn PDF document text
    • https://cdn.sqhk.co/diwamukef/ihw7zqq/24038562022.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/ggja8jF/wibotajefofu.pdfIn PDF document text
    • https://cdn.sqhk.co/migefareg/f4jikgc/boohoo_clothing_site.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/qqL9vjf/golf_on_mars_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/zozotetowa/jc86hcg/mukanufatar.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/ggjjgOp/dumebotipukazaviniradixa.pdfIn PDF document text
    • https:///\/a10.gaanacdn.com\/images\/albums\/94\/2035294\/crop_175x175_2035294.jpgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://werowelunan.epizy.com/rigikot.pdfIn PDF document text
    • http://vudatuvabejosix.epizy.com/fiwiponujipabonabumawi.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A45 5336 bytes
SHA-256: b6272dd1e0313b02febfd9221dbcd0b2906623e4b43090bf93a829b1e3c7b7d7
font_01_sfnt_off00015c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C3E 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off000167a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A1 10568 bytes
SHA-256: 191a289b064e42544f2001f6b89651f466a75b37a0cc894bb41223a996efe387
font_03_sfnt_off00018bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BFE 14132 bytes
SHA-256: 6daf0abb0fcd8145f649603423ece1eec0fc493fcc9e49cdf0096c98e99a1529