Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5aff63d6cecad27…

MALICIOUS

PDF

83.7 KB Created: 2021-03-18 19:34:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 68696ad0afe483b5e8f2edfd7269b270 SHA-1: 0ac62663d5eb071d74e0e103af748c755a5d32f7 SHA-256: b5aff63d6cecad2766573414ddda4dba06dc0a02626bb5d066ef29f95ce8bb09
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=wd+my+cloud+home+review+2018 PDF link annotation
    • https://moraraxewurazi.weebly.com/uploads/1/3/4/0/134042425/879d4c3a5ce0a65.pdfIn PDF document text
    • http://kitufavurakural.iblogger.org/84384172509.pdfIn PDF document text
    • https://cdn.sqhk.co/wasuxuletiz/jOn5DuQ/readworks_answer_key_foot_binding.pdfIn PDF document text
    • http://kowabasozawe.iblogger.org/the_adlard_coles_book_of_diesel_engines.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/55dc18fba53a4b.pdfIn PDF document text
    • https://vepoxiwoja.weebly.com/uploads/1/3/1/1/131164136/ridulevovus_rurakojomeduvuv.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/gii1gg4/movistar_el_salvador_planes_prepago.pdfIn PDF document text
    • http://topcabinets.xyz/stihl_autocut_25-2_line_sizeelbd8.pdfIn PDF document text
    • http://ita-talia.fun/cs_1.6_cd_key_code624aw.pdfIn PDF document text
    • https://rawuwivusezorom.weebly.com/uploads/1/3/1/4/131406564/7967327.pdfIn PDF document text
    • https://kenibojowosude.weebly.com/uploads/1/3/5/3/135324683/linimimowa-vavuvifegux-diwaxan.pdfIn PDF document text
    • https://cdn.sqhk.co/kigowabalo/x9miart/97443582070.pdfIn PDF document text
    • http://wumalazari.22web.org/lazibewumigavawuwowusazir.pdfIn PDF document text
    • https://lovelutunaguj.weebly.com/uploads/1/3/4/7/134735325/6539088.pdfIn PDF document text
    • https://morimisinasezub.weebly.com/uploads/1/3/1/8/131856414/tiberapukadela_saxozoga_moxajolamaxemi.pdfIn PDF document text
    • http://straponartist.com/75182453954ub3o2.pdfIn PDF document text
    • https://cdn.sqhk.co/sowovupo/PiftjjI/teste_de_antiglobulina_humana.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://balazetesu.epizy.com/vazadosirolilujola.pdfIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_32f3a2d82ba243aa9ce1a59b2912c653.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_93aee091c8684617872c1abf598c8714.pdf?index=trueIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_93e680935bde4a7daf1f037fa10e232f.pdf?index=trueIn PDF document text
    • https://4c69d07c-928c-405f-a1ab-6436392658c4.filesusr.com/ugd/4c264d_a9a4a25cf2b74179bf310500d0e11a7f.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_14b36a3ca51843c0a4e7301559ea7c6d.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 5276 bytes
SHA-256: 9c96f4fdba97e690df05dc1e6dcf4cd7bb63736ec4760eb2de796952078877a7
font_01_sfnt_off00011057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 10024 bytes
SHA-256: e2a716e135885a56b8f29ec12c1dacae382a66178f5de5fa8c463007629b0cb5
font_02_sfnt_off000132c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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