Malicious PDF — malware analysis report

Static analysis result for SHA-256 3106a756d0007bec…

MALICIOUS

PDF

78.6 KB Created: 2021-04-01 16:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 386c797cf67b0fba59092a0ec19860a1 SHA-1: b68976e1f758473d0b181fe0ba1ba7dd532524e4 SHA-256: 3106a756d0007bec7cbe71302daddbba1858861667e7f356ac8f2fe47e34b9e7
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including PDF_SEO_LINK_FARM and PDF_URI, pointing to numerous external URLs. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of numerous external links and the 'link farm' heuristic indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://dafemum.ru/strik?utm_term=tom+clancy%2527s+rainbow+six+siege+trailer+ps4
    • http://hallop.xyz/what_percy_jackson_god_is_your_parentn3aa7.pdf
    • http://limecash.xyz/hunger_games_book_report_example6qlmx.pdf
    • https://verulofu.weebly.com/uploads/1/3/4/0/134012380/balupemo_jelajopovop.pdf
    • https://bolamowoxuwev.weebly.com/uploads/1/3/3/9/133997192/wizagutowomaka.pdf
    • http://braco.ru/acrobat_reader_windows_10_64_bitngmvk.pdf
    • http://wisitens.online/significado_de_artes_plasticas_obrasnm2ki.pdf
    • http://steelsho1.club/pet_rescue_saga_facebook_errore8m4a.pdf
    • http://3bureaureport.info/is_stock_investing_for_dummies_a_good_bookaj50n.pdf
    • https://kisogegexene.weebly.com/uploads/1/3/4/3/134374262/rudegudipuke_milile_vawotojon_xakinipisusa.pdf
    • https://bogewugarut.weebly.com/uploads/1/3/1/4/131483108/diwami.pdf
    • https://waniritapi.weebly.com/uploads/1/3/0/7/130739375/c8790681ce2a5bb.pdf
    • https://naloxepakore.weebly.com/uploads/1/3/5/3/135391327/c1f7a7f07fba741.pdf
    • https://nepunifanod.weebly.com/uploads/1/3/4/5/134524507/nurak.pdf
    • http://salonly.xyz/76575606890ngmdg.pdf
    • http://clebohets.xyz/percy_jackson_demigod_filesw4017.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/serogajugomiji/apush_chapter_6_reading_guide.pdf
    • https://s3.amazonaws.com/tulosa/powimuvarivoz.pdf
    • https://s3.amazonaws.com/padadutiseni/21223079941.pdf
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_63c555e47eae47b78d36490a52b0c14e.pdf?index=true
    • https://s3.amazonaws.com/xijilesuzuxo/first_aid_2017_corrections_2018.pdf
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_1547d11003a84c7ca7ce2788ce39f940.pdf?index=true
    • https://s3.amazonaws.com/petubapizo/61417843272.pdf
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_8225ff1916c84ff8b574f45ba951a64e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b6.bin
0888caaf43796890e30f29d719b40c7497a38b5f605af247ab895e44ba779734		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 5516 bytes
font_01_sfnt_off0000f880.bin
0dbd4d29e7774bdec6a2f73104ef64b22b2ccf74b109df0d79ecea8cab6b51fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 11308 bytes
font_02_sfnt_off00011ec5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 4324 bytes

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