Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51818be755fc14d…

MALICIOUS

PDF

73.7 KB Created: 2020-12-04 15:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3ebbf5eb5de5a1bed8ae27e96ddc2030 SHA-1: 7c9b10d2ee6916176735325a24e52cb7870a69d4 SHA-256: a51818be755fc14d91edc3afc6d035b1ce5a5fd610a9cf311cda20431b016f98
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. One prominent URL, 'https://trafffi.ru/123?utm_term=fortnite+account+calculator', indicates a lure related to Fortnite accounts. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffi.ru/123?utm_term=fortnite+account+calculator PDF link annotation
    • https://kalizijowu.weebly.com/uploads/1/3/4/7/134733304/29401c26.pdfIn PDF document text
    • https://kutusavirub.weebly.com/uploads/1/3/4/2/134265758/murugorobupel-zabarusifok-xukitut-mapanavosasare.pdfIn PDF document text
    • https://puxokobipo.weebly.com/uploads/1/3/4/5/134524361/9a32ebdbeb.pdfIn PDF document text
    • https://wuzesitawe.weebly.com/uploads/1/3/4/7/134733123/a9ea361e8.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/bagisi/jivobo.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/muvixesazadixibenofotalu.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/11672150526.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/96406747655.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/lurov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/412c82c9-51a8-4d9b-94cd-bb60e9e3d453/soap_opera_role_playing_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d941cef-416e-430a-bfed-98c36d017dac/100m_200m_training_program.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/8997042333.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/79031044410.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/dikagogabezixaxivigogol.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/beach_worksheets_esl.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 4572 bytes
SHA-256: 09074178b4010162a5182b8077a5ff4418a5f49077f4f684f7eb89047b42b4dc
font_01_sfnt_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 10508 bytes
SHA-256: 2dfbc0074b761d2103cb55abb3073e8d86fb45beb12f60d23c6723fbf16bbefb
font_02_sfnt_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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