Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e63f155e73ae15…

MALICIOUS

PDF

77.6 KB Created: 2021-02-17 04:27:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e587f21d53cd3904c188859e27d3b1b2 SHA-1: 555ecf0070d955732914c86139336f16f2f2947d SHA-256: a6e63f155e73ae1521f322ce797bd85574ae2ad8e37ad66dbcde46402f9c7c50
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' designed to generate SEO traffic. The document body, though partially corrupted, suggests a lure related to vacuum cleaner maintenance, which is likely a pretext to direct users to malicious or phishing websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the distribution of further malware or phishing content via the embedded URLs.

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://seumenha.ru/strik?utm_term=how+to+change+an+oreck+xl+vacuum+bag PDF link annotation
    • https://rudixesawemes.weebly.com/uploads/1/3/1/1/131163949/jujulanunovowifes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391327/normal_5fc60f5f3910d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460460/normal_5ff75806d63f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455208/normal_5fde931c3ae6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_5fd731c4a4f53.pdfIn PDF document text
    • https://sagerogokijisoj.weebly.com/uploads/1/3/4/6/134601402/15c36966f58673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_6022f52331fed.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/gebukil/nisedoduxigu.pdfIn PDF document text
    • http://motirovaribepok.rf.gd/predicting_ionic_charges_worksheet_answers_4._15.pdfIn PDF document text
    • http://buwozefavimim.epizy.com/33253628664.pdfIn PDF document text
    • http://guxovoxed.rf.gd/bulk_density_of_aggregate_test.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/gartner_iot_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/biology_11_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/70710309645.pdfIn PDF document text
    • http://suwulinivez.rf.gd/rujakemamajime.pdfIn PDF document text
    • http://bevaritil.epizy.com/15098256733.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/kiwirizavofopakelumatoxum.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_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 5420 bytes
SHA-256: 074569f1dc61b0481cd984f2301fa204b32df329aa4a3a5743fff67128a553ec
font_01_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 11280 bytes
SHA-256: 95ece0b9b9c09460ec142b33c97f208c218c975542efd20009bb60e2db61b57b

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