Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2086a48d05ff83…

MALICIOUS

PDF

75.2 KB Created: 2021-03-15 06:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 62a555f9041d4d2182e29ce9c26e991e SHA-1: 24e03324a59057e45c9ac6a7876bf6b4a559d2bd SHA-256: 6b2086a48d05ff83aed577d086310223ee7e63376f0de785ead9198788b5b9d1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to 'vilenefex.ru', suggesting a phishing or SEO manipulation scheme. The PDF structure and embedded links are consistent with techniques used to distribute malware or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://vilenefex.ru/wix?keyword=tv+themes+ringtones+free PDF link annotation
    • http://nibitekafo.22web.org/nigirajepolenajaz.pdfIn PDF document text
    • http://faketikus.22web.org/imsai_arasan_video_songs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c465d7d-3380-487f-b16e-7467cf872bb5/what_protein_to_eat_on_alkaline_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ac1aba7-713e-4e93-b720-86886a91d275/disney_cast_member_complimentary_tickets_2019.pdfIn PDF document text
    • http://zajobape.epizy.com/free_vpn_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7d0877-b509-434d-b8e2-e60732f8fa06/why_are_official_statistics_reliable.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/nnmc_wramc_wound_dressing_selection_guide.pdfIn PDF document text
    • http://bunakakivukutus.epizy.com/pofubajotadawodakutuje.pdfIn PDF document text
    • http://jukopiwiguf.rf.gd/mijenuxojufijuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/346b6277-0918-4147-8975-4609b8a01170/what_is_one_example_of_a_nonliving_thing_in_an_ecosystem.pdfIn PDF document text
    • http://dilepivulibav.epizy.com/baidyabati_weather_report.pdfIn PDF document text
    • http://juzefabamurever.rf.gd/lisaregozabujamesifojiz.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_4c152bace59c43b291469dbcff0b27fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e8d39b2-a95c-434c-a15a-a8df7a592e74/13432327835.pdfIn PDF document text
    • http://merilejefug.rf.gd/fairy_tales_story_books_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/free_wifi_calling_app_for_android_2019.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_5eca121c1ca8488fafa213dd162c7d9c.pdf?index=trueIn PDF document text
    • http://votofeki.epizy.com/compass_rose_free_printable_worksheets.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 4948 bytes
SHA-256: 56ed2c20046ace208b2ae84dd57012dee53ec41004fd3f11acdfbe1f822a9900
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 10804 bytes
SHA-256: 096cca460d620d7c4556da940e14cedf34b44b38b6a9539ac6e2fcf228262a2c

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