Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6f1c08928eba7f…

MALICIOUS

PDF

103.5 KB Created: 2021-03-22 23:09:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c82ab9361b19a20d5f84c919c06aff84 SHA-1: 549d5cfecbb51e7cf02a973ddef301d2119d3f79 SHA-256: cb6f1c08928eba7f618436e29244f0d76cabd4f022db9a05df31bf9acbb0df6b
156 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 0.9997

Heuristics 5

  • 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.
  • 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://leonvi.ru/123?utm_term=guide+demandeur+d%2527+asile+paris PDF link annotation
    • http://smm-target.ru/verisina65gzv.pdfIn PDF document text
    • https://mekilogeb.weebly.com/uploads/1/3/0/7/130775247/fisugelu-lagadurizan.pdfIn PDF document text
    • http://a-trvl.ru/womiramosiselasifovuwakorp1hnh.pdfIn PDF document text
    • https://cdn.sqhk.co/muzipajat/cMZjaig/atomic_structure_class_9.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/aRidiir/instagram_app_login_issues.pdfIn PDF document text
    • https://subegudikowezi.weebly.com/uploads/1/3/4/4/134476363/bakirumame.pdfIn PDF document text
    • http://wimudevereru.sportsontheweb.net/kevumugun.pdfIn PDF document text
    • http://petrol-v-pol-price.site/why_isnt_my_alcatel_chargingur9am.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/gchfoie/wanekokakowaliludukari.pdfIn PDF document text
    • https://lexikusu.weebly.com/uploads/1/3/1/4/131438729/d3d291.pdfIn PDF document text
    • https://vemomomofaj.weebly.com/uploads/1/3/2/7/132740815/ab7fde479ae6135.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/nowowigewe.pdfIn PDF document text
    • http://adyga.site/california_primary_election_2018_candidates_informationetc91.pdfIn PDF document text
    • http://pasendapp.online/auriol_weather_station_instruction_mrkmfc.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/luropi/contoh_uji_non_parametrik.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/1992_ford_f150_manual_locking_hubs.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/95120954440.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/79195209781.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/pance_prep_pearls_citation.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/52674727657.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/xiridejoriwiwiwusimotipof.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/mipokixanonabezagizis.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000154f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F4 5172 bytes
SHA-256: e870c67cdddf9384791adea9b2614cf4a49a4eb5441d3f2948c5830f75d57a90
font_01_sfnt_off00016674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16674 12928 bytes
SHA-256: 1ca01055a58afe74c586558a4a4b91b52fb5dbb86af5b9f7d23fe8cba99f9b3e

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