Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e95335e490b763…

MALICIOUS

PDF

81.2 KB Created: 2021-03-27 16:21:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eda04641b9f09263f9e3a72a708aabad SHA-1: bd9b9358dd1660e94d7a35af8cd355ea62212428 SHA-256: 85e95335e490b76326d55137fb4d4beabf29c8b6f9128ec7af4ea23130db4e56
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO poisoning tactic. One of the primary links, 'https://dugedepap.ru/strik?utm_term=how+to+forecast+exchange+rates+in+excel', is suspicious and likely leads to a phishing or scam page. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=how+to+forecast+exchange+rates+in+excel
    • https://cdn.sqhk.co/kilobubag/khexsgg/85381313480.pdf
    • http://tusalolorow.22web.org/stihl_fs55r_price_used.pdf
    • https://cdn.sqhk.co/morureju/Hgihggi/royal_farms_chicken_nutrition.pdf
    • https://cdn.sqhk.co/bugolajoxodu/cVididt/darkness_and_flame_4_walkthrough_bonus_chapter.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_0a5ee270b9724d2dac6f618f370e7f53.pdf?index=true
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_d008530882fb4afb86da04fcf6a65e90.pdf?index=true
    • https://s3.amazonaws.com/tipikaxe/wutepenudokuvom.pdf
    • https://s3.amazonaws.com/fevobelijogal/why_do_i_have_blister_on_my_hand.pdf
    • https://s3.amazonaws.com/bezegoluzose/ford_mustang_ecoboost_engine_cover.pdf
    • https://s3.amazonaws.com/guvovigo/27540979477.pdf
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_ba2502d5dc094015b6c0411ec8ca1641.pdf?index=true
    • http://nixewawomito.epizy.com/cassadaga_movie_free.pdf
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_f90075f59c7541dab0be2aabe19fcfc9.pdf?index=true
    • https://s3.amazonaws.com/lonozote/fafelifuvi.pdf
    • https://s3.amazonaws.com/latufenaw/asme_y14_5m_2009_tolerance_chart.pdf
    • http://gesejovefovu.rf.gd/97418487287.pdf
    • https://s3.amazonaws.com/widiku/lpcxpresso_1769_datasheet.pdf
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_c0905398b3304f9ab015f66112358728.pdf?index=true
    • https://s3.amazonaws.com/wofaxil/bulldog_vaults_magnum_series_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13e.bin
e033f64e75177ff71db12d1eb2e88f89bf52e0acecb68b3393895cf5a2bd1316		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 5052 bytes
font_01_sfnt_off00010270.bin
fb1fe97145614e118f31e8a3ba8cedd00fc113690dbe8efbcb45b7461dc12e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 10852 bytes
font_02_sfnt_off0001279b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 4324 bytes

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