Malicious PDF — malware analysis report

Static analysis result for SHA-256 5764f40204c6c555…

MALICIOUS

PDF

77.4 KB Created: 2021-03-03 22:28:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 063cee487490a60fe118d86e46116042 SHA-1: 81048376e952b720763f21f201d072259b1bfab4 SHA-256: 5764f40204c6c555d55c154185d1e530b46df495d7a2b423171a3062cc191b39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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

  • 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://midufefew.ru/aws?utm_term=head+of+data+analytics+jobs+uk PDF link annotation
    • https://jugijivarute.weebly.com/uploads/1/3/4/6/134620481/6778712.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/jbgeSgv/13734825933.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/fMhjCjj/lab_escape_room_urbana_il.pdfIn PDF document text
    • https://luvoseguz.weebly.com/uploads/1/3/4/6/134665560/4853690.pdfIn PDF document text
    • https://cdn.sqhk.co/lopumilekana/Ihhz4id/ant_killer_spray_indoor_and_outdoor.pdfIn PDF document text
    • https://tufanemoxidubux.weebly.com/uploads/1/3/4/3/134315727/e8468b.pdfIn PDF document text
    • https://lozorodarefela.weebly.com/uploads/1/3/2/6/132681783/dudurideji.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/hfjiDcp/lejibigimaxo.pdfIn PDF document text
    • https://gerikolobel.weebly.com/uploads/1/3/1/3/131398187/jawat_nutagutapofu_xujetujudonev.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/3hfwpqf/pixel_cup_soccer_16_mod_apk_android_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sazexuxezife.rf.gd/onyx_ezr_with_home_kit.pdfIn PDF document text
    • http://favekagopu.epizy.com/17969154703.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/81297960632.pdfIn PDF document text
    • http://vepejatudededok.rf.gd/pilot_a_one_english_grammar_composition_and_translation_10th_class.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/75807060738.pdfIn PDF document text
    • http://wujewepal.epizy.com/molle_ii_assault_pack_multicam.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/georgia_sales_and_use_tax_excel_template.pdfIn PDF document text
    • http://zotuxegusam.epizy.com/siwobuke.pdfIn PDF document text
    • http://pujekejiwevote.epizy.com/zetosumasesupojexobik.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/caballo_de_troya_audiolibro_1.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 5264 bytes
SHA-256: 52febf8301d968cbd374bc7962a403b1fbcda352ff34f990659bb347946fe828
font_01_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 10388 bytes
SHA-256: 08c745fb83bd62bf4326d734008c313c38d0cb8e9b66655dcb6e60ab5df03f55

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