Malicious PDF — malware analysis report

Static analysis result for SHA-256 051f8b584ac95356…

MALICIOUS

PDF

84.2 KB Created: 2021-04-01 00:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c89b73b92e139c63bb4322094a5e610c SHA-1: 7325eb8e4c890003917e0cae3eaf837255e0e521 SHA-256: 051f8b584ac95356560eb499e718dbc596805ba69432862ba6798da0074e3f45
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 0.9990

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.
  • 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://xezojetit.ru/wix?keyword=sabrina+perez+reyes PDF link annotation
    • https://sudodufutela.weebly.com/uploads/1/3/5/9/135960501/nukoxudafusisujufo.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/taking_sides_gary_soto_summary.pdfIn PDF document text
    • https://fekamudubop.weebly.com/uploads/1/3/5/3/135325245/6239644.pdfIn PDF document text
    • http://freud.icu/fifa_world_cup_2018_schedule_australiaj8cq2.pdfIn PDF document text
    • https://nufupegovofa.weebly.com/uploads/1/3/4/1/134131424/8604642.pdfIn PDF document text
    • https://sefagovat.weebly.com/uploads/1/3/4/4/134402874/kujedomotufonop.pdfIn PDF document text
    • http://heartcenteredequestrian.com/what_is_a_normal_a1c_count_for_a_diabeticaz3ew.pdfIn PDF document text
    • http://yourdesk.website/50464983267dadru.pdfIn PDF document text
    • http://reawolt.online/81991743365ej0wx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_ec70d1f972af45259405a4c41ae0f279.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_6a000a044f0c47a8b91456b7b7e51e97.pdf?index=trueIn PDF document text
    • http://zudupaxub.myartsonline.com/how_to_change_battery_on_a_polaroid_camera.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/catia_tutorial_video.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/cursive_writing_letters.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/retinose_pigmentar_tratamento.pdfIn PDF document text
    • http://fepusum.onlinewebshop.net/loxanejugilisuvaniwetoxa.pdfIn PDF document text
    • http://gegokuberil.rf.gd/can_u_netflix_episodes_on_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/wakumorupijolazunojug.pdfIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_45e81bf2888f4f3fad34cc1c11d3b4ea.pdf?index=trueIn PDF document text
    • http://wigezenefibi.epizy.com/36264031244.pdfIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_351df33993944a8282c2d89b178baa5f.pdf?index=trueIn PDF document text
    • http://tazipebikitunir.rf.gd/chemistry_revision_questions_and_answers.pdfIn PDF document text
    • http://beliraguw.onlinewebshop.net/27877146498.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/android_book_app_maker_full_free.pdfIn PDF document text
    • http://segoxegigo.epizy.com/59716320403.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 5176 bytes
SHA-256: 8be4379eebe4e276334df641cf14cc7fb99dfa4f317764fc3d8638123c90cc87
font_01_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 4976 bytes
SHA-256: ab4ebc59b080e350f81b29e63132fefe5d5728dd82990cf85707648df880caea
font_02_sfnt_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 13284 bytes
SHA-256: 81e72970b1289059a26bbd386b479d5b1e3e3362e0e2caf0805acb6cb3bfc115