Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4e78ae69e75866…

MALICIOUS

PDF

79.9 KB Created: 2021-03-19 14:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fff3856bfd026c9dce3660bcdc83e70a SHA-1: 78da76d4875aa11aab346a11302329d392a82113 SHA-256: 6f4e78ae69e758660e956ebb5b35eac2feee591bda837538325aae60356ff9f8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://jumiwimov.ru/strik, which likely serves as a landing page for further malicious activity. No scripts were extracted from this sample, but the extensive use of external links points towards a phishing or malware distribution scheme.

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-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://jumiwimov.ru/strik?utm_term=myles+munroe+children
    • http://lipegilu.iblogger.org/bonding_in_organic_chemistry.pdf
    • http://ogranicbio.space/gi_vn_ht_sheet2nq95.pdf
    • http://simekavo.22web.org/98885778611.pdf
    • http://lnstagaram-verifiedbadges-from.com/manualidades_con_reciclaje_para_nios_de_preescolarsh4wt.pdf
    • http://gaydating.world/knightdale_elementary_school_report_cardge5xu.pdf
    • http://airned.ru/how_to_winterize_an_rv_with_airsz57w.pdf
    • http://henrysavbr.site/which_smartwatch_is_best_under_5000ata5o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bifamomove/gotranscript_audio_test_answers_2018.pdf
    • https://s3.amazonaws.com/tasufagijaremo/how_rich_are_the_dobre_brothers.pdf
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_9042b13f9b934462913cbafefc6b3dcc.pdf?index=true
    • https://s3.amazonaws.com/bugutaj/pinnacle_video_capture_for_mac_free.pdf
    • https://s3.amazonaws.com/jefobexapulow/do_stoves_still_have_pilot_lights.pdf
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_4412836820394563af3869e76aa0865c.pdf?index=true
    • https://s3.amazonaws.com/faluzotixupi/69114864301.pdf
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_5996610dc6e7481ead6e9231aea3d4d1.pdf?index=true
    • https://s3.amazonaws.com/welanisowari/muniwixanesukikafap.pdf
    • https://s3.amazonaws.com/lunojol/nuworuge.pdf
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_730eac8dc73449f68fb7ebe36cd0a00e.pdf?index=true
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_5fa4f3ae01e841f3840c6a9f2cfb075a.pdf?index=true
    • 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_off0000f9c8.bin
83f98d63e015cd1ead48ce905166689065827f45ad32b65d80de4c1bbbc7924c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 5076 bytes
font_01_sfnt_off00010af2.bin
7529e69d3185af459cd00cdce5e22836b0153c4dba20eb5aa66d84446d761372		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 11972 bytes

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