Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3a1ef2b66aed04…

MALICIOUS

PDF

109.1 KB Created: 2021-05-26 20:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bfb86d2deaaf4d1afc91be0e6fae3218 SHA-1: e6d2897ef63133960c4aa9602265278189961af1 SHA-256: ef3a1ef2b66aed0452966989050114738e09d31e52de5e64b2914591b5974f92
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=oracion+de+los+dones+del+espiritu+santo+para+ni%25C3%25B1os PDF link annotation
    • https://rokumetusemep.weebly.com/uploads/1/3/4/3/134382705/juxizimiza-betokiwirimurav-xizuloj-wijomufen.pdfIn PDF document text
    • https://xijozidirosem.weebly.com/uploads/1/3/4/7/134712871/bujajaxasa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462732/normal_60609c72c6262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_603e8501a119d.pdfIn PDF document text
    • https://jerezuwiwufuken.weebly.com/uploads/1/3/4/3/134355676/nisuxifipomaj.pdfIn PDF document text
    • https://xibuderopugef.weebly.com/uploads/1/3/4/0/134042602/c44b347.pdfIn PDF document text
    • https://mojisavavuke.weebly.com/uploads/1/3/5/3/135312470/09d9104748efbf.pdfIn PDF document text
    • https://luvimemisa.weebly.com/uploads/1/3/4/6/134681541/vubobaguzotiva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449193/normal_60092fd48a037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_6020d290e395c.pdfIn PDF document text
    • https://xupazipul.weebly.com/uploads/1/3/5/3/135325103/9641009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_600b6cd2ecaf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455406/normal_6047aad989360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460476/normal_603c2e5c97309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_6028e6e724b45.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/zadagowonemaj.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/0ee640eb-557d-4a13-ac27-525444b17a7f/character_in_midsummer_nights_dream_with_the_head_of_a_donkey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8251ff8-bc09-4f1f-b3bc-dab9b8aba6ab/32581214914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc4013d-90d2-4627-8ae1-8c92f1fe5715/wii_virtual_console_games_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468007d9-0f4c-408b-90d1-a68270264a28/niv_large_print_reference_bible_personal_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd7bca5d-b3e0-485a-9db8-e6a77335b5fb/mizanimufureboz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1185acc2-6e5e-4eab-9fc8-fd4e73a6e7e1/sigadixazivesaninajamorig.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_off00016a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A5A 5308 bytes
SHA-256: 8fbc149c50f1d965e0c73d6745d06e25564cb7c7089c514a0f961b320d368bb9
font_01_sfnt_off00017c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C2A 12200 bytes
SHA-256: 32e99b5b924f23b52557b49e0feb8c3aca25fc1d0a6f52af968bd2f9bcc6b014