Malicious PDF — malware analysis report

Static analysis result for SHA-256 5047783ff876332f…

MALICIOUS

PDF

87.1 KB Created: 2021-05-08 14:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de33a94d094628a73ad2aa213429a0e3 SHA-1: a44d426a8eb0393f2969ecfb4b54e50de10e494a SHA-256: 5047783ff876332f53e3cbda64852066187cde2db737150ad07e683c5984e475
164 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 hosted on dynamic or suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/strik?utm_term=how+to+calculate+previous+date+in+excel
    • https://cdn.sqhk.co/fowipovoji/aKjbajh/6726666002.pdf
    • https://cdn.sqhk.co/woxemumi/iGjjufJ/ba_flight_glasgow_to_london_city_airport.pdf
    • http://alphabitx.com/star_wars_knights_of_the_old_republic_2_revan_robesv12ks.pdf
    • https://cdn.sqhk.co/jofutagi/YdKtjaE/merge_gun_3d.pdf
    • http://kelnoteres.xyz/myers_briggs_infjyxjk0.pdf
    • https://cdn.sqhk.co/mezomabesoki/id63zhi/how_to_do_a_wedding_cake_topper_unicorn.pdf
    • https://cdn.sqhk.co/wixexozesila/ofhi2if/neon_jumpsuit_shorts.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/widiku/abaddon_ii_regular_font.pdf
    • https://s3.amazonaws.com/piwanisaj/jinirafi.pdf
    • https://s3.amazonaws.com/xovekolamoxe/putamemimamizavul.pdf
    • https://s3.amazonaws.com/paxivogedewilu/26881540021.pdf
    • https://uploads.strikinglycdn.com/files/06852609-f44f-4888-97f9-e2d26a762d4a/19350952559.pdf
    • https://s3.amazonaws.com/dudujopixejikug/companies_house_register_of_members_template.pdf
    • https://s3.amazonaws.com/sesafefanulokam/voodoo_labs_pedal_power_2_dimensions.pdf
    • https://s3.amazonaws.com/sefabe/61685599722.pdf
    • https://uploads.strikinglycdn.com/files/bfb7cdaa-f114-43a2-8cd3-4c72a6da7d85/mcgraw_hill_education_science_answer_key.pdf
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_196a48b4c3ce4dfaa41f7c80e8718eaa.pdf?index=true
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_d481ef34795346e2b6257f8c7dbfe16b.pdf?index=true
    • https://s3.amazonaws.com/mejigavukolu/39065530622.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_off00010851.bin
837372a4504df626af7383ee7cf10aabe3d8e7e666c407df37449347aec9468a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 5128 bytes
font_01_sfnt_off000119e0.bin
8f2d384763bba3ea0b5a74d2d06e278781fb44704dda8ea7c459293d0ec0a544		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 11416 bytes
font_02_sfnt_off0001411d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1411D 4324 bytes

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