Malicious PDF — malware analysis report

Static analysis result for SHA-256 3855a16955483cfb…

MALICIOUS

PDF

80.8 KB Created: 2021-03-23 01:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 51156b582e5a92d5256c04cce0f2d58e SHA-1: 5771234b65ed49b48cb0af6acacf0e9aed8f592f SHA-256: 3855a16955483cfb69d15ce7b10dff799540651501dd65de7453bd4c62ba71f7
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 0.9954

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://zajinet.ru/strik?utm_term=electrical+engineer+jobs+in+littleton+co PDF link annotation
    • http://whitecheat.xyz/nanesinagigikawulhneqy.pdfIn PDF document text
    • http://bexixibeguben.sportsontheweb.net/dd_4e_monster_manual_free.pdfIn PDF document text
    • http://zuduwamani.mypressonline.com/game_of_thrones_season_8_episode_6_download_in_tamilrockers.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/lutabodami.pdfIn PDF document text
    • http://degimogug.mypressonline.com/40471503257.pdfIn PDF document text
    • http://slmit.space/how_to_look_up_michigan_medicaid_number7u8qe.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/what_is_the_theme_of_the_book_code_talker.pdfIn PDF document text
    • http://bionatur.space/encyclopedia_of_spiritsf598o.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/56092399166.pdfIn PDF document text
    • http://pixelbarista.com/wekebakunul013rk.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
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_7ac947898be74622a0a73413f6476bb6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ce71f83-1ba9-4259-b298-2e1d67cb3e63/sonoma_county_businesses.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_26b09e57d1d842ee98efdf73c2d88fc3.pdf?index=trueIn PDF document text
    • https://d7504aae-3d37-493f-8789-a5629a6fcc30.filesusr.com/ugd/7ca9f5_59820c7fd5714f058a401e3fe5495ea4.pdf?index=trueIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_b57026c2984840279ada9f2a92d15901.pdf?index=trueIn PDF document text
    • http://levapoloj.onlinewebshop.net/sarenasolabukibosaloze.pdfIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_a563f9a30fe64c2bbcd8f1563970a4b5.pdf?index=trueIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_6ab5164883284e3faafa62e328359cef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdfce59a-3b55-4a7e-a0ba-cb1aef582d85/53045663722.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_464d3d79867840a492b6f4e4efb9b7ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07cdab8b-6d91-4622-891e-4c8ce1348e97/lewomogapaleved.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/vesaladazulewafeb.pdfIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_928019b1546144329957ea479a43695b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37c6fc3-dffc-4f8f-aaba-0e8353cbcc21/78483914646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c82b0b-9644-4bc1-98c0-6dde86b770c1/kiwamapimuxazavamon.pdfIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_4f298c97f0054afa915a9578bf81fa05.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 4928 bytes
SHA-256: 0e3bd0375047f441f9c070814319dcbbf9cb85eb19467aa56ab6337a5de484ed
font_01_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 10604 bytes
SHA-256: 9b29d55092fd1c719553a48788fae4f7c7247c1d333265f2af6c9deb74cf98a4
font_02_sfnt_off000126e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176