Malicious PDF — malware analysis report

Static analysis result for SHA-256 28df42951c66ef2d…

MALICIOUS

PDF

78.7 KB Created: 2021-04-28 01:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76b25f1ab635f1be69faf97057e6de8a SHA-1: 2e76fe071a087c5ecbc19414eddd28f92f9560e7 SHA-256: 28df42951c66ef2dfb9f7c9267c4075b9c1324aa5f6df6c785d8673ab0d7c4a0
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are obfuscated or lead to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS heuristics. The primary external link, https://vilenefex.ru/strik?utm_term=drug+calculations+for+nurses+made+easy+ppt, suggests a phishing or scam attempt disguised as useful information. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=drug+calculations+for+nurses+made+easy+ppt
    • https://cdn.sqhk.co/defisepeniba/ivjgbje/moon_whalers_gif.pdf
    • https://dekudabor.weebly.com/uploads/1/3/4/8/134893804/satisulu-bijufusavisa.pdf
    • https://paxupodef.weebly.com/uploads/1/3/4/7/134763896/soliw.pdf
    • http://arnautmebel.ru/how_to_get_paid_for_writing_an_ebookz77jh.pdf
    • https://jewakazakiven.weebly.com/uploads/1/3/1/4/131437085/1805866.pdf
    • https://cdn.sqhk.co/lumolixuwo/chg9ggN/sad_cat_stickers_wastickerapps.pdf
    • https://wetexojozow.weebly.com/uploads/1/3/0/7/130740218/xukutadota_tibidug.pdf
    • https://vijudapakov.weebly.com/uploads/1/3/4/6/134677764/5314568.pdf
    • https://fopezifu.weebly.com/uploads/1/3/4/7/134717551/58902abf.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/how_to_start_an_occupational_therapy_practiceh6z2a.pdf
    • https://cdn.sqhk.co/repudodo/didphrf/holy_city_of_islam_clue.pdf
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/881a37b4b7579c.pdf
    • http://usacarins.com/39036779555ma917.pdf
    • http://pipavinekiga.mywebcommunity.org/jeu_de_cartes_spider_franais_gratuit.pdf
    • http://naturalik.fun/lep_s_world_1_level_12_4moq04.pdf
    • http://libopadu.scienceontheweb.net/advanced_charts_in_excel_2020.pdf
    • https://moninedowilex.weebly.com/uploads/1/3/1/4/131436981/80c1a0cdd7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/27e7f373-f51f-4667-95a8-bfb888c8235f/pevuxejoxosanidudokanimi.pdf
    • http://pekamidakoj.atwebpages.com/aristteles_potica.pdf
    • https://uploads.strikinglycdn.com/files/a0ac9e92-c268-4b71-8719-0126978259d1/aci_301-16_section_8.3.1.pdf
    • http://woranuganavot.myartsonline.com/china_s_1979_war_with_vietnam_a_reassessment.pdf
    • https://uploads.strikinglycdn.com/files/6030267c-233f-4d93-aab4-473addaccfe8/how_to_make_a_moist_maker.pdf
    • https://uploads.strikinglycdn.com/files/e358c7ea-bed4-40c3-9df0-1b260475cff0/gerenotilezigawuloxuviver.pdf
    • https://uploads.strikinglycdn.com/files/9ef1cd5d-9d1c-4886-b7e8-ca465d938869/example_of_covid_19_policy.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29e.bin
6d0f7dceb70b6ee45e864ce4bafd4b32465e09fe20e9ad600b4e4b73b26e498d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 5576 bytes
font_01_sfnt_off00010590.bin
7bcc23f80fa055747c55d04e7ef6ccdca3ce0f22063ea0c9831694d47c448ee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 11760 bytes

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