Malicious PDF — malware analysis report

Static analysis result for SHA-256 805935afd589fe68…

MALICIOUS

PDF

78.0 KB Created: 2021-03-17 06:56:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 015e4efc3db45b1114dcc5512d06623c SHA-1: dfed6c0fbb656250b42439a187a1c4e1af8e488f SHA-256: 805935afd589fe68c99fcad2645c56858f5682a1d1b6dbe80135750876227ff4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to disposable domains and link farm websites. This behavior is indicative of a phishing or traffic-driving scheme, where the primary goal is to redirect users to potentially malicious content or advertisements. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/wix?keyword=mugen+online+play PDF link annotation
    • https://tofejigijo.weebly.com/uploads/1/3/4/3/134312142/pozesi.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/jbbu8kp/rotator_cuff_surgery_sling_pillow.pdfIn PDF document text
    • http://online-sistem.site/choreography_app_free3obd0.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/iexDyji/fm_2018_best_strikers.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/168201.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/words_that_start_with_prefix_inoe3dh.pdfIn PDF document text
    • https://fenejetamop.weebly.com/uploads/1/3/4/6/134697978/wewuwaxo.pdfIn PDF document text
    • http://powerhdniy.space/diccionario_ingles_espaol_larousse4i5bj.pdfIn PDF document text
    • https://kuxobemif.weebly.com/uploads/1/3/1/3/131379353/nixubudorirate.pdfIn PDF document text
    • http://robolab.one/los_7_habitos_de_la_gente_altamente_efectiva_descargar_gratisag3el.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/4th_grade_multiplication_word_problems_grade_4.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/djahfqu/find_a_way_addictive_puzzle_mod_apk.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/kitchenaid_stand_mixer_blue_ice.pdfIn PDF document text
    • http://basiditdcf.space/stress_management_group_activities42p3e.pdfIn PDF document text
    • http://tetoxukipim.getenjoyment.net/45232562011.pdfIn PDF document text
    • http://metryck.info/ergobaby_infant_insert_user_guideeh0q7.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/nanuze.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/htiha5e/dixobegopil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://weparaxopulo.atwebpages.com/zemipomuzupurazenibukak.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_cf6371495fc14196858f6f48d1de1369.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_b6462d4f0b7443458b38eb7433251a74.pdf?index=trueIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_5f3d2841f70e454fb5ab05133a5d4ef7.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 4820 bytes
SHA-256: de92e7392cbc5d61295ef6864d011caf937fae109b86a06e2cf68d484fb50840
font_01_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 10768 bytes
SHA-256: 9e19f3c714396d37ba54adc6610c63b77e5d73e2852556680495df5358b06473