Malicious PDF — malware analysis report

Static analysis result for SHA-256 396da51901a28a6c…

MALICIOUS

PDF

80.7 KB Created: 2021-06-02 09:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c8d726456f569713d33dd25204a0d6bb SHA-1: 5a306255ef302668837958e37ccd6512505d7a9c SHA-256: 396da51901a28a6caf15518423d8c2cb74c55bf7e6edd84c6a470e6dc695d46f
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, which is a common tactic for distributing malware or conducting phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://krisoc.ru/pbw?utm_term=mahabharata+short+story+in+english+pdf PDF link annotation
    • https://wenadexedodoren.weebly.com/uploads/1/3/4/3/134322255/teganolisof.pdfIn PDF document text
    • https://gamojomifelaja.weebly.com/uploads/1/3/0/7/130739258/233333.pdfIn PDF document text
    • https://reragoposezexel.weebly.com/uploads/1/3/5/9/135958934/vedobelemolaw.pdfIn PDF document text
    • https://gafewabonir.weebly.com/uploads/1/3/2/6/132696171/32140fe7ee.pdfIn PDF document text
    • https://radasezase.weebly.com/uploads/1/3/4/6/134643415/nimepo_korebam_banidiwunul.pdfIn PDF document text
    • https://bejobajota.weebly.com/uploads/1/3/4/7/134727936/260567.pdfIn PDF document text
    • https://menusopam.weebly.com/uploads/1/3/4/5/134597334/0f2f6f0e35866b.pdfIn PDF document text
    • https://gemujofu.weebly.com/uploads/1/3/4/3/134372819/legusud-lajesejekekedaw-pefemazavesevo-dikoseduzuse.pdfIn PDF document text
    • https://muwewemumefiga.weebly.com/uploads/1/3/0/8/130874681/vaxuvegivot_juxap_feganerokoraga.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/8466519.pdfIn PDF document text
    • https://kipakuliviz.weebly.com/uploads/1/3/4/2/134234746/didesogubanipuf.pdfIn PDF document text
    • https://gebigimudixerez.weebly.com/uploads/1/3/4/3/134374499/muludibugozal.pdfIn PDF document text
    • https://logosomuzabi.weebly.com/uploads/1/3/0/9/130969340/jagivazefuk.pdfIn 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/4601e1cc-128e-4e1b-b49f-f98e3e3042ea/bofusapumawugigevunosos.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144427551/neniluj.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/quienes_eran_los_sirios_en_la_biblia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f20690d6-218a-4d77-89b9-44e433c0fe50/where_can_i_find_kanais_cube_in_diablo_3_ps4.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/f/sirisuwip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601aaf0d-dfa4-4172-bf66-00576c94f097/the_princess_bride_book_read_online_free.pdfIn PDF document text
    • http://vawijoj.pbworks.com/w/file/fetch/144447720/69697458605.pdfIn PDF document text
    • http://gemometis.pbworks.com/w/file/fetch/144483696/the_amazing_spider_man_2_apkdata_mod_unlimited_coinsoffline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97cf9dc7-a0f4-4145-afa6-52def6f76213/19763309062.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/w/file/fetch/144483672/buxobum.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/w/file/fetch/144455208/how_to_do_level_80_on_brain_test.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_off0000fe4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 5548 bytes
SHA-256: 65a07e8ec3bfee53c8d4eae412a1fb0a485280b5b5929fa08a7a87c6fa147737
font_01_sfnt_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 10520 bytes
SHA-256: 294d04bb0220ef2c8155535d9392fb813ac9f34afc8c6fce847a48488a11c8be