Malicious PDF — malware analysis report

Static analysis result for SHA-256 92be9eb0482392b1…

MALICIOUS

PDF

69.9 KB Created: 2021-04-28 22:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 727873c061f45837ecc56211dfca3735 SHA-1: db6d5ee4e6f0adbca06b5d36475d0842008667ac SHA-256: 92be9eb0482392b1091d44fc65cc415fe3ebfe0b5752b1e9b61b96f69c76a3ff
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 S3 buckets, suggesting a link farm or a distribution mechanism for further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware delivery attempt, likely leveraging embedded JavaScript for execution.

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://golowaki.ru/strik?utm_term=the+great+gatsby+anticipation+guide+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459034/normal_6019cb60cb64e.pdfIn PDF document text
    • http://kexedoliresile.22web.org/como_fazer_referencia_bibliografica_de_arquivo_em.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_60361327bd57e.pdfIn PDF document text
    • https://liwotagavujid.weebly.com/uploads/1/3/5/9/135961529/d6b72.pdfIn PDF document text
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/1006267.pdfIn PDF document text
    • https://dajurejew.weebly.com/uploads/1/3/4/7/134753869/5325471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470679/normal_6067ed8562ff4.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/jeduzizonox/2643969997.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/delicious_world_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/temesa.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/xamimadi.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/jikavakoda.pdfIn PDF document text
    • http://vidojizo.rf.gd/bay_area_map.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/addition_polymerisation_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/nhs_self_certification_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/58637254776.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/does_pukka_detox_tea_make_you_lose_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/woxurajiwonujis.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/2007_buell_xb12r_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/20972676204.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_off0000d2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 5584 bytes
SHA-256: da1b8c058246f105f15a4f12e047f35207e5eb613f2aaacc3a78d03187e138aa
font_01_sfnt_off0000e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 10648 bytes
SHA-256: 84dc8392b4e5825401d18b49527f7ad3a4febcbef97e277cc0dd4e1967682ff7

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