Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3484eb128258e2…

MALICIOUS

PDF

96.3 KB Created: 2021-04-22 14:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e5e0ae6dfc451265571bc3bba2eb2587 SHA-1: 77e62010e7f542fd95e8caa086a03c3683715973 SHA-256: 3b3484eb128258e208b513f71b7c4bd9fddd0080664fa3bfb81d9d0a0feac590
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards techniques used to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://midufefew.ru/strik?utm_term=how+to+build+a+red+green+magic+deck PDF link annotation
    • http://leqqurint.online/ruregimotalivuzofowajudaj6a7m.pdfIn PDF document text
    • http://meetsucre.pro/how_to_be_a_bawse_book_online8qr75.pdfIn PDF document text
    • http://gtmedis.com/kimex8rsnn.pdfIn PDF document text
    • http://slamelina.website/meiosis_reading_comprehension_worksheet6rsno.pdfIn PDF document text
    • http://instacopyrightcenter.com/5207081945545tgc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fizufapu/97661268480.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/saxoluwalukuk.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_4db34162d9b2489689166f9e0104b225.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/broken_2014_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc5b2c4-99b4-4602-adba-e9cf697a9a1d/86414325725.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_40a81daa3b914514b5344d742aa7af33.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/736eb576-6bc5-417f-b743-86dae9246de4/35737638196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0080b8d5-9973-4b5f-b62f-aba0feb5a007/mathematical_analysis_rudin.pdfIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_223d6151bc374cdf803b2d11ac5e5481.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/547c391e-51eb-4719-b138-2d9345debcff/calories_in_wendys_baconator_fries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0671617-8f9d-44f3-871a-63796acce4fc/waxex.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_4941c149a66944abb00a11ef541bbffb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fixararololu/21413529702.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/8731255883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6711bccf-8dc5-427f-aa2b-3896c76283be/60810707151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02962c8b-a815-4bd4-b5be-bb9d8e75d017/32146781191.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_ea448ae4484f40eeb5a867c841883a69.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fcdc228-f4c7-4a35-ae9f-1412bb756750/does_the_playstation_gold_headset_work_on_pc.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_off00013afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFA 5340 bytes
SHA-256: 27bc674014af3267660bc66dff9b9d4dadd8f0b5c308a34efe71acd8e223a908
font_01_sfnt_off00014d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1C 11448 bytes
SHA-256: 10613614238c7c2f9533bf0ed987df915b780fba96a5a7e9a7a9da8767244c13