Malicious PDF — malware analysis report

Static analysis result for SHA-256 9460ceb2333bdd2f…

MALICIOUS

PDF

80.2 KB Created: 2021-03-04 14:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 62cb2bcedeebf2b3497fa8a860166b31 SHA-1: 520591fa9e9f939bbc92b03bd648333b20cb7065 SHA-256: 9460ceb2333bdd2fabc8980358d8d6dcb71cb77d0877c43157e9c99696b7d65b
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious content, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://vilenefex.ru/wix?keyword=the+importance+of+a+mentor+teacher PDF link annotation
    • https://cdn.sqhk.co/dadakafopina/0Pgjtae/pawunin.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/5ff3caba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402519/normal_600555e731018.pdfIn PDF document text
    • https://fizijoju.weebly.com/uploads/1/3/0/8/130814030/3163180.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/how_to_setup_multiple_lnb_dish.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/simple_pencil_drawing_images_of_nature.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408485/normal_60183741ebc49.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/is_fantastic_beasts_based_on_a_book.pdfIn PDF document text
    • https://muputobiga.weebly.com/uploads/1/3/5/3/135308906/motadavizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_5fd9e017e4a23.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifoxunif/nieqOZJ/monsta_x_offline_kpop_tour.pdfIn PDF document text
    • https://cdn.sqhk.co/genepajev/qgcjiYw/lifajub.pdfIn PDF document text
    • http://xejitifuwoligaf.mypressonline.com/kenmore_elite_dryer_model_796_heating_element_replacement.pdfIn PDF document text
    • https://kezamipi.weebly.com/uploads/1/3/0/8/130873984/9219920.pdfIn PDF document text
    • https://dazutexigamufo.weebly.com/uploads/1/3/2/7/132740900/vinojexefexid_keber_boxof.pdfIn PDF document text
    • https://vajugape.weebly.com/uploads/1/3/4/7/134767319/tinanelowojex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488137/normal_5ff05b511a955.pdfIn PDF document text
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/xurogiruk.pdfIn PDF document text
    • https://gazasajud.weebly.com/uploads/1/3/4/8/134879445/404c5.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/4461245.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/qP3Hhjd/bopawadivebete.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/ipod_mini_watch_case.pdfIn PDF document text
    • https://gusemotasejodab.weebly.com/uploads/1/3/2/7/132741535/wutik.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/what_is_computational_thinking_in_education.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sawesupunozigiv.atwebpages.com/ilive_bluetooth_soundbar_with_detachable_satellite_speakers_for_surround_sound.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/nimumoketozegotabar.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_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 4780 bytes
SHA-256: 3347fab960a8f297b248b1d25e98868a1e83a7c45522782529153bcc7d4e896d
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 10236 bytes
SHA-256: c87d11f91a1d474d9bfc6fd9b3faac1ad432d858af52c7b041904e406e7ce844
font_02_sfnt_off000124bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361