Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be5a893876aba01…

MALICIOUS

PDF

75.1 KB Created: 2021-03-26 09:12:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eef51511cb3d3c6a66c0b361dfa938b SHA-1: 744ae15d61804308a321ff7c5a5d298b78b73d27 SHA-256: 0be5a893876aba01f77d0ec2399b020f59a0dd41b8d9509cb2008e501e6e47a7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm, suggesting a malicious intent to manipulate search engine results or distribute further malicious content. The ClamAV detection and ML classifier strongly indicate this is a malicious PDF, likely a phishing or trojan variant. No scripts were extracted, but the presence of numerous external URLs points to a content distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/123?utm_term=magazine+pdf+file+free
    • http://tufodudem.mypressonline.com/49245540768.pdf
    • http://vofigasu.medianewsonline.com/51631256311.pdf
    • http://xijipeva.mypressonline.com/7870626439.pdf
    • http://nurimipo.22web.org/ludekijibadafifazol.pdf
    • http://tetupamino.mywebcommunity.org/variables_affecting_counselling_process.pdf
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/sekafozofolozenuj.pdf
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/tivuzusosov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pupekafujobuda.rf.gd/55923418314.pdf
    • https://s3.amazonaws.com/gotenukevepunin/83397183043.pdf
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_7434cae6fa53472aaba2495ab2292fc6.pdf?index=true
    • https://s3.amazonaws.com/wolina/sociologija_religije_hamilton.pdf
    • https://s3.amazonaws.com/sixenogafopoj/74186137207.pdf
    • https://s3.amazonaws.com/fikuvine/32404566708.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/treasurers_report_template_for_nonprofit_organization.pdf
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_8e628a7fd5f54ec8a520a7d33181e1bc.pdf?index=true
    • http://vizulubafaxal.epizy.com/informed_consent_survey_template.pdf
    • https://s3.amazonaws.com/fewifuwu/audi_rs7_performance_0-_60.pdf
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_d00dfce781fb444daa55a2b7e6169160.pdf?index=true
    • https://s3.amazonaws.com/satudifin/48225082603.pdf
    • https://s3.amazonaws.com/popisiburewixuj/kcet_2018_answer_key_maths_set_f.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a8.bin
83b8ec6bcba87765f2c938dc78f856e4aa87a9e07b3d77618ac9e6f4f1e60fdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 5088 bytes
font_01_sfnt_off0000fb1e.bin
462318c18c1df43711cfc80ca1e5b803e3217830604b65934b9acbdb8874c50a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 10660 bytes

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