Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aac7927e06bda5b…

MALICIOUS

PDF

109.9 KB Created: 2021-05-13 04:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c862f34a9a03af74e84c0a2a2a8e390 SHA-1: 92970f2ba9e4e3fae992a81e5031175ddb9abc43 SHA-256: 5aac7927e06bda5bda5d2a586463f98d017e97c1cba850fa3b4efc90484758cd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary technique likely being Spearphishing Attachment. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to a malicious site or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=new+american+bible+old+testament+books
    • http://saratov.ooo/ariete_coffee_machine_manualzpw0z.pdf
    • https://cdn.sqhk.co/zogobadakedu/Wgjgjie/yeet_meme_sound.pdf
    • http://bnl-jobs.com/gen_kzlar_iin_iyi_kurgu_olmayan_kz5hye.pdf
    • http://erogan-oficial.site/fifty_shades_of_grey_full_movie_download_dual_audio_300mbe5cga.pdf
    • http://ersoil.fun/dozawedoxosigadirunigaz7mrfr.pdf
    • https://cdn.sqhk.co/jasojime/pEVNiet/royal_chaos_banquet_guide.pdf
    • http://gabibaz.22web.org/oxford_first_dictionary_free_download.pdf
    • https://cdn.sqhk.co/rijatazuga/ggiK65C/54242760884.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bf4c09bd-1f58-4ea4-9504-96e089020c5f/35033160174.pdf
    • https://uploads.strikinglycdn.com/files/1941223e-77bb-4a20-b42f-b9d585fa61f9/sherlock_holmes_book_collection.pdf
    • https://uploads.strikinglycdn.com/files/560355bb-c1f9-41cf-a8bd-02d9bee07354/fomazuxobaza.pdf
    • https://uploads.strikinglycdn.com/files/751596a6-9ca9-492b-adcb-8f9d8a688d90/2262544429.pdf
    • https://uploads.strikinglycdn.com/files/2cc41f5d-01e0-4c81-bf4f-16745a7f1080/qu_son_signos_de_entonacin.pdf
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_c95ec26449e848a6b94799c18ceeb0ac.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a6f89469-2c79-4f3b-a64e-9b96bc33c5ce/95674956278.pdf
    • https://uploads.strikinglycdn.com/files/46fc2bab-9c83-4d5f-81e6-35308e593bf3/ruvidolanumab.pdf
    • http://wixojoxa.epizy.com/sustainability_accounting_standards_board.pdf
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_95a67832e5a148bfa2f3716392eb0dd1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b329d436-6312-4bd9-9592-69137d98c6e6/how_to_fix_oil_furnace_ignitor.pdf
    • https://uploads.strikinglycdn.com/files/2ed2a693-93a8-44f1-9a43-e35dbb44a40c/zemotiluxomek.pdf
    • https://uploads.strikinglycdn.com/files/4316bb2c-7c35-4a8b-befc-955082987359/fepagakavunisoromag.pdf
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_fb674e901b414d11bb6c2c49bba24443.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_off00016aa2.bin
4c200b16584188d2c6629716ff9a00a1d4fc99d8633360aa9460dc7ca9243fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA2 5352 bytes
font_01_sfnt_off00017ccd.bin
8b8e5e6027d281569135b6a7dcb81f2cc8fded1c13d731a1374c3004052cb0fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17CCD 14004 bytes

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