Malicious PDF — malware analysis report

Static analysis result for SHA-256 7061d7df8204d8e9…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 06:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d22a6dafb9460690c9157fe5f2be144 SHA-1: 2d4bcc874f4a1a802bacb1102e537bb7814db787 SHA-256: 7061d7df8204d8e9d0a892d788e2d9f62a4605379b4c6e76351cecc8ef829dc8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://vilenefex.ru/award?keyword=overactive+bladder+adalah+pdf, which is likely used to redirect users to a malicious site. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=overactive+bladder+adalah+pdf
    • https://cdn.sqhk.co/ponajadu/hG7higi/gedesirijegamigakivosomu.pdf
    • https://cdn.sqhk.co/tixunudixa/eLC3Ljf/subway_surfers_hack_2020_ios.pdf
    • https://cdn.sqhk.co/larovejadeb/jaUhbvU/wunatekoj.pdf
    • http://policyhelpcenter.com/press_kit_band_template5rixg.pdf
    • http://osmosiotzs.fun/mefujulofilokinepg7oz3.pdf
    • http://axacheat4.xyz/6628252868a11ck.pdf
    • http://instapriz24.online/gosivoronijizamikogagova8o40.pdf
    • http://icily.xyz/bombay_dyeing_diwan_bed_sheetsv5f6h.pdf
    • http://badgesverified.com/uefa_champions_league_final_2020_time_tvwxn5l.pdf
    • http://casbah2point0.com/xalufiwiwuzibadamow9w08h.pdf
    • https://cdn.sqhk.co/rukokota/7i7H1yD/oscar_the_grouch_costume_infant.pdf
    • https://cdn.sqhk.co/numobelez/ijaQaIW/korebixakegogipuko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a386e7cf-0602-4c50-b182-e69ee9aeee88/64012972855.pdf
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_feec66dabfd442149511b29314254e0c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cecb90aa-fda2-403b-908c-176d2e90250e/pigetolazonisupafizap.pdf
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_a2a94938cb504a9e98003c38d9369eec.pdf?index=true
    • https://d7504aae-3d37-493f-8789-a5629a6fcc30.filesusr.com/ugd/7ca9f5_a5794ef3c4c84334b063c72e0f1441d2.pdf?index=true
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_e7e921c57d614213b3c4f60ed5e4c6de.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b5296f10-6aef-4afd-81ee-8533938d6331/bobcat_709_backhoe_mounting_brackets_for_773.pdf
    • https://uploads.strikinglycdn.com/files/7ed8eaf0-488e-4629-a23d-1cb7803b671d/eotech_518_review.pdf
    • https://uploads.strikinglycdn.com/files/34911119-3de6-47be-901a-4513e0822ec6/2013_jeep_grand_cherokee_limited_for_sale_near_me.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_off0000f617.bin
2757ec8adb32919668bc4017d37b7b027fe01ce913fbf79ee71b66636cd24de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 5292 bytes
font_01_sfnt_off0001080c.bin
f4cff3485bb588aa8f8a097567046e85ff123856ab7951c14ffbbf7d9e4e9046		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 10488 bytes

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