Malicious PDF — malware analysis report

Static analysis result for SHA-256 4deeb6f7c3a0a345…

MALICIOUS

PDF

78.9 KB Created: 2021-06-04 14:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f035c2e8494ba83924777bcab6b491a3 SHA-1: 52b6d0b2fa33cc7045c73184af930bc4e84c1c48 SHA-256: 4deeb6f7c3a0a345d1d005614b824be835f4cacdb91cf119111a4ed50a7acbe2
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 0.9950

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://coretry.ru/pbw?utm_term=finding+radius+and+diameter+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474450/normal_605c706aac94f.pdfIn PDF document text
    • https://luvalebasewe.weebly.com/uploads/1/3/5/3/135326782/1a47466065b60c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459057/normal_5fdfd3b9473de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424029/normal_60175c54ec452.pdfIn PDF document text
    • https://konizalo.weebly.com/uploads/1/3/5/3/135388679/58568a1c4f63101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_601bb6cfb0655.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/3691039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389820/normal_602d1e194df82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_60107aa1bca7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390660/normal_5fe5ba034d1de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426073/normal_5fcc25a512c38.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/008a6eae7.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://juvupumanut.pbworks.com/w/file/fetch/144498273/rivopunesaxuxurubolufavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424c53a2-8c08-4f05-a720-af4e856dac64/make_your_own_carbonated_water_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4869407-40cf-4686-a2cd-4723abe4b5c4/coleman_catalytic_heater_wick_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4aa5633-7609-4cc3-a0d5-ad90a2389c1a/dadax.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/f/58279640887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aef1abe-6249-4ee4-8e74-2776918b8214/what_are_the_most_important_quotes_in_macbeth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bddca99e-8a1b-4e0c-9ce2-19961a351667/gafidariravafogemeduvi.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/cars_fast_as_lightning_mod_apk_unlimited_money_and_gems_android_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b17294-e810-4ec0-a640-f34e733484e6/70084719024.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/how_to_add_friends_on_switch_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a021263-89e9-410c-99fd-ffc0f1af2016/learn_english_grammar_games_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/879bfe6b-7dee-4cff-997f-cd19268ae325/48693170417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/573158ee-20fc-4d96-a31b-05c1c379884e/sovobijixifir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4273757-b53a-4068-a326-a278a1ae11b3/why_is_my_dvd_player_not_reading_the_disc.pdfIn PDF document text
    • http://pidexuxok.pbworks.com/w/file/fetch/144603441/kia_sorento_2011_service_repair_manual_free.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_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 5200 bytes
SHA-256: 40d5d3e0464bb708c0d7c4f3efb012fe16edff8ee9ff4241eaf17eeffbb2f442
font_01_sfnt_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 10840 bytes
SHA-256: 37aa11dc83011335d15719dd88ea4a785748e143df381d215f9adb73868e3eba
font_02_sfnt_off00011fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2