Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d547b813e5dad7e…

MALICIOUS

PDF

131.0 KB Created: 2020-12-26 22:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 50c4692a654f335df084d0736ff56384 SHA-1: 7fb79a6b8633037eb2e564dd0b20334d9adf43b2 SHA-256: 5d547b813e5dad7ec0d4eb1e567a05a7a66f7c4d2f9d81726fb06111bf1a994c
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, many of which are hosted on Weebly and S3, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically as a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafffe.ru/aws?utm_term=french+to+english+pdf+google PDF link annotation
    • https://rofajubufilotol.weebly.com/uploads/1/3/1/3/131384128/lalidalalikixav-wofev-radike.pdfIn PDF document text
    • https://fiwenozagor.weebly.com/uploads/1/3/4/3/134363395/8162831.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/df1796a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368954/normal_5fe54d58bb516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411220/normal_5fe2c02e9f324.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/ludabopoge_tamij_lajefejo.pdfIn PDF document text
    • https://nozudasukexip.weebly.com/uploads/1/3/4/4/134441991/7554707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_5fda17bb66d9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_5f91bb112df3d.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/femowobizovivajema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409113/normal_5fb5836455077.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/sevoga/bulupugugotugufosovefofas.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/92408147411.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/fimukilup.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/mimevawewo.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/polycentric_approach.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED2 30780 bytes
SHA-256: 8149834c51ac8d683f95277f7dacc82a96750d469fceeb2d4a08433d0e903865
font_01_sfnt_off0001ae67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE67 5160 bytes
SHA-256: cb29491f0608a686de433dfbcba7b0677ad61e3fdb716f6f19732a9c6f664b87
font_02_sfnt_off0001bffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFFD 12472 bytes
SHA-256: 2fa7a065df13f5c03c4846097ed59a98437716036d5369ec6d5ef619df771cd3
font_03_sfnt_off0001e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7D6 16068 bytes
SHA-256: bd4ec210b6f0bed3603b49d512cd9a08d3e9d1e81fcf206800274a46106400dd

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