Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0759ba64267fe92…

MALICIOUS

PDF

93.6 KB Created: 2021-04-25 00:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bf608be73b3a2ab34dafa13fcdeb96a7 SHA-1: ce47f7f5d3fc62f7838eef2c8076b0f111919258 SHA-256: a0759ba64267fe922b2c47b26c7d85cfb08ee1005a04039ed701d4731a076cc6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm hosted on disposable domains, suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/strik?utm_term=quran+recitation+with+meaning+in+tamil PDF link annotation
    • https://cdn.sqhk.co/lanumakefu/NhcegjL/89620964510.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/9182332.pdfIn PDF document text
    • https://mokasinerosun.weebly.com/uploads/1/3/2/6/132682676/6dbec19.pdfIn PDF document text
    • https://delidago.weebly.com/uploads/1/3/0/9/130969485/be7cb0fd8e53ed.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuputid/NThjgfJ/draw_climber_free_arcade_run_games.pdfIn PDF document text
    • https://cdn.sqhk.co/mixasuwekov/BgdheX1/pinball_go_big_win_real_money.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/X4S7icW/project_progress_report_sample_doc.pdfIn PDF document text
    • https://suzitarux.weebly.com/uploads/1/3/4/6/134683800/1369444.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/ighhygN/99928849881.pdfIn PDF document text
    • https://xiresipi.weebly.com/uploads/1/3/1/1/131164504/e56c3a32a872.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/709b83a5-c83b-4361-a8fb-48780dc36a38/46615908596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc5e09e-ad6b-441f-af12-71f130e3cd15/ruvamob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14e248b-8e06-4919-b87b-3b30f65b137f/68986415258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9fcf009-9393-44be-95e1-6587e4c709a8/mipirilurarajuvilugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c48b1f-7d59-4b6f-acea-79d8e2508d76/last_sacrifice_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c5dc11-55cc-4a5c-b794-9e6b5569ed20/93316382780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f8f58b9-8bff-4fce-8465-f282bf6f64e7/watch_forged_in_fire_online_free_123movies.pdfIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_a0d5d3e646d74181ae296250ed034ad9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c06c14-ab35-4188-9c28-8c7b613a7f46/wabozitu.pdfIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_c69de8bc737e4b0ab67fa57d7155f580.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e81b93db-41c0-4772-aed6-bdf54c2faf5d/how_much_do_software_engineers_make_in_california.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000eef3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEEF3 22352 bytes
SHA-256: 84c0274389837e4f74f3d1e8bc33b2005d318285b1a8a4bcf1c6b5e2f1bac87e
stream_006_off00013ff1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13FF1 21696 bytes
SHA-256: def6e4a8943c27779c094d56cab781be7fd9ee57da2c12d64641aa675b4292a5
font_00_sfnt_off0000dd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD67 5188 bytes
SHA-256: 9eae01909c163cb2d5e980046372e5465ae95f656b7c2ebf3ae76b082000717f
font_02_sfnt_off00011e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 9924 bytes
SHA-256: 2df62afcbb35f2fe5a3de6813a4ddff885538926c0a684f5580ae637bb4ff67e

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