Malicious PDF — malware analysis report

Static analysis result for SHA-256 619a0cabd536dc3a…

MALICIOUS

PDF

88.3 KB Created: 2021-04-19 18:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6575fc1c747265f3db55a7e40aef3c73 SHA-1: aba04f2cb801513af3f2c5bd5f92dbd0367375af SHA-256: 619a0cabd536dc3a0d6b139a8a426da264791c89f3321b9f1f7b062835edd084
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://pelibifir.ru/strik?utm_term=is+the+book+behind+closed+doors+a+movie PDF link annotation
    • http://libertinemodels.com/55593998432v48mp.pdfIn PDF document text
    • http://vigastlens.xyz/zedge_free_ringtones_for_iphone_xc29td.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/s3jfwge/29010331875.pdfIn PDF document text
    • https://piwozasemoxusi.weebly.com/uploads/1/3/4/3/134378412/geparimofidurukokog.pdfIn PDF document text
    • https://zexiditituluw.weebly.com/uploads/1/3/4/7/134734655/8760921.pdfIn PDF document text
    • https://kosofisipituje.weebly.com/uploads/1/3/5/3/135329454/puxukujowifav-renoguzoj-zijuwon.pdfIn PDF document text
    • http://purpless.vip/interrogative_adjectives_worksheet_answers4yhgs.pdfIn PDF document text
    • https://ripafikumitepi.weebly.com/uploads/1/3/4/6/134622323/2103435.pdfIn PDF document text
    • http://dmgameplan.com/timekipuxanuhq2s1.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/i1z2IQC/fruit_ninja_classic_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fafopikej/awsia16/64434920284.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_000987f1f207402f80adf3109178882f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/loxixopitirajufibifi.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/intel_dx58so_bios_jumper.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/14926293835.pdfIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_7485e6410dd34811854999d7ff39b0d9.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_628474a0ab0b4af1bfc75a84951ed401.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_ceeacbf6cc3b45f5a77554f4ba90cd3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/sewinumidin.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_off00011b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B11 5380 bytes
SHA-256: 8f1f104e2620c5fae4c9b51ad29584a079abdea3b30f116b3941dea68b2e1c29
font_01_sfnt_off00012d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D34 10860 bytes
SHA-256: 2670e61d2c3eabe2777c9dcd2781fe864f1f6b166445cf3608547c79a87b97f8

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