Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fcc50eb09df9e31…

MALICIOUS

PDF

75.8 KB Created: 2021-05-28 19:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1806fac73d46815d078f692b6f29dbe0 SHA-1: 766d16af80fb929479e06d92f29d28abeef8a207 SHA-256: 1fcc50eb09df9e31fc5cda0747f88727da52b31735d61dc2203a10d772662e25
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 0.9993

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://xajibur.ru/strik?utm_term=stick+warfare+blood+strike+cheat+codes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5ff66e8ced222.pdfIn PDF document text
    • https://lajibomigijiku.weebly.com/uploads/1/3/4/5/134587714/sexosegi-vumexerol.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/8633787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368237/normal_6014291f3946b.pdfIn PDF document text
    • https://vobilafulov.weebly.com/uploads/1/3/4/9/134902573/3973708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_6022a7ecf09eb.pdfIn PDF document text
    • https://nimizinimaji.weebly.com/uploads/1/3/4/7/134703428/kibotujubeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527164/normal_602631a22a8e1.pdfIn PDF document text
    • https://wixiwifutavoma.weebly.com/uploads/1/3/5/3/135301275/kenube_lafibafifut_kimejega_nowovosajeni.pdfIn PDF document text
    • https://ferowadamo.weebly.com/uploads/1/3/4/5/134593689/4321852.pdfIn PDF document text
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/7651434c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473645/normal_6063dcd1943b2.pdfIn PDF document text
    • https://lasuresupaka.weebly.com/uploads/1/3/2/6/132683400/mikedib-durud-pixiwitepemekat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_6056d3bed1bbd.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/06aee69f-2b6f-444f-9743-1897e664a708/44350302317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c15e52f-83f5-42f1-bd42-ec06bfe65bcb/naruto_hokage_mugen_character_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9ed9bf-3889-4de2-9aa3-713a062acd6c/93043112147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4030d7df-7981-4a68-bba2-6a79bcc50e3e/keralagiponibole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a67b2bc-f984-485d-9084-f8f72537983f/21222430451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c131c6ca-467b-4148-92e2-52d816d91b04/12727184219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/956925e6-c87c-4694-9ed7-e31cc1d1f3bc/actividades_para_nios_autistas_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/395c65bb-a828-46bc-bbdc-514abeab5a20/can_you_buy_individual_stocks_in_a_401k.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66dba0cf-8ecb-4a84-84fd-bccfe1b16889/double_down_full_movie_free.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_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 5508 bytes
SHA-256: d16197d426658a4983c61e164b7a70caf1f5c4832457ab44b368caff37c900d8
font_01_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 11140 bytes
SHA-256: a2f9aef09cfde1bc4609f1e5f68bd8af29d18bf001fbcc24c5f998ed71d1bc04