Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbdb0cdc91b8a8d…

MALICIOUS

PDF

75.8 KB Created: 2021-05-22 14:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6a1aa00d988c17f415cf62d6e3f53f3 SHA-1: dd1415e67697ed0b5697c362521daa47d000ec9e SHA-256: 3cbdb0cdc91b8a8d86bc74974bdbd1d997492545a8e937d03d53ff62b348d5a7
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 pointing to PDF files with numeric slugs, indicative of a link farm or SEO manipulation. The primary URL, https://nipisod.ru/strik?utm_term=eh+carr+what+is+history+pdf+in+hindi, suggests a phishing or malicious redirection attempt disguised as search results. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nipisod.ru/strik?utm_term=eh+carr+what+is+history+pdf+in+hindi
    • https://watagejikifawup.weebly.com/uploads/1/3/4/5/134589749/xujajemorugerogevu.pdf
    • https://xasotuda.weebly.com/uploads/1/3/4/2/134235861/jajezenoduwiguliziku.pdf
    • https://kerobasoxegetun.weebly.com/uploads/1/3/4/0/134017970/lesewo.pdf
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/gapalijuje.pdf
    • https://giminefimir.weebly.com/uploads/1/3/0/9/130969553/961211.pdf
    • https://zivotawab.weebly.com/uploads/1/3/4/5/134576919/zukinufigo.pdf
    • https://boxuxavuviw.weebly.com/uploads/1/3/4/7/134716171/86592365e34557.pdf
    • https://doguxugufini.weebly.com/uploads/1/3/0/7/130739878/7025003.pdf
    • https://nuzojumikosa.weebly.com/uploads/1/3/0/8/130814298/podalegukobo.pdf
    • https://lugilabujenubo.weebly.com/uploads/1/3/4/3/134320616/2203177.pdf
    • https://remejatezikame.weebly.com/uploads/1/3/1/0/131070309/zogigitujovosisimofe.pdf
    • https://pavofadibap.weebly.com/uploads/1/3/4/3/134370944/wubojovebape.pdf
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/888523.pdf
    • https://fuxopejebema.weebly.com/uploads/1/3/4/0/134018858/mapisedulofuveluzira.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/budovewesekaz/44553409337.pdf
    • https://s3.amazonaws.com/vofadoloves/bonatoreluto.pdf
    • https://s3.amazonaws.com/baposivarabuj/caderea_constantinopolului_vintila_corbul.pdf
    • https://s3.amazonaws.com/jovekus/similar_shapes_worksheet_printable.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_off0000e8fc.bin
1824c3078e37a01e28f4bb55f41c1fa7e5ac4f7297b5fa3cf085ab55d49ec1e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 5364 bytes
font_01_sfnt_off0000fb52.bin
51ae4cd4937b194b4cb8546b05e9c874b41efdc85d08d0a721561d6f1041c81d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 10924 bytes

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