Malicious PDF — malware analysis report

Static analysis result for SHA-256 6956405964b5494d…

MALICIOUS

PDF

125.8 KB Created: 2021-03-22 07:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cddabb23aa9069c3124e8d6d13cc1180 SHA-1: c4dac70b417671c965ad9cd1eb76a11b6775266f SHA-256: 6956405964b5494d6c2ef831d9fae2557a65d691acd017eef87993477bfa78a8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The embedded text '2019 java games' serves as a lure to attract users to these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/123?utm_term=2019+java+games PDF link annotation
    • https://misirukizos.weebly.com/uploads/1/3/4/0/134017349/d2bc6447c11e69c.pdfIn PDF document text
    • https://xevogivuzu.weebly.com/uploads/1/3/5/3/135350373/5875354.pdfIn PDF document text
    • https://felonuwonab.weebly.com/uploads/1/3/0/8/130814100/vujuxitemofaj.pdfIn PDF document text
    • https://panubawo.weebly.com/uploads/1/3/5/3/135337149/tepujinisawu_guvajanunil_nejetibuvito.pdfIn PDF document text
    • https://vifefafu.weebly.com/uploads/1/3/4/8/134876142/f80b53e6083f72.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/bijizegukubig.pdfIn PDF document text
    • https://zagemixawidi.weebly.com/uploads/1/3/1/3/131378918/74f9e6fd5c46d6.pdfIn PDF document text
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/2e9361b34df.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/d1860837c75c7c.pdfIn PDF document text
    • https://nolelagisumo.weebly.com/uploads/1/3/4/1/134132353/fanuwug_xobuk.pdfIn PDF document text
    • https://mewurotimopu.weebly.com/uploads/1/3/1/3/131381658/1585087.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lefemijip/76078863839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1642cb6-7d8c-4c69-8463-bb05a90c45c8/dogeneseravetav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6612e300-3cd3-42db-93c7-f3486c2f1f35/majujimoremura.pdfIn PDF document text
    • https://ad217471-f301-4d07-b05b-71cdb813ff8b.filesusr.com/ugd/4f915f_f197df5ba9b8433ab2886bd4f4e36837.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab986c7-faa3-4292-8278-99876b600bf0/48809656497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1d843d4-c186-4d42-99f0-0171275ed233/kindergarten_math_addition_worksheets_free.pdfIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_783c0968871b4fceb3b275557b5794dc.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_800ccf7f06164e7d9f4d9c27a4ea7263.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/method_validation_protocol_template.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_1998c13f66944b3e859354350f6dc7b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/arjun_reddy_full_movie_tamilrockers.pdfIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_5dadab5406e54c9182e2b40a93e9b65c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedowedi/boluduzukexuwijajeso.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 67660 bytes
SHA-256: 7184e0b6ed1b09599584e5932325ce8d6eb7a57d005069427835f14300d7c693
font_01_sfnt_off0001b0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0AF 5400 bytes
SHA-256: 9d88f3540f50f235a4354adb14e157a38103867d45511cc52e39bb43ec72111a
font_02_sfnt_off0001c310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C310 11284 bytes
SHA-256: edd45f9000a5ad530a72a163ac3e1df880d654f026397ea07eef8f1d32ade9ed

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