Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9738008988bd3e9…

MALICIOUS

PDF

75.7 KB Created: 2021-02-05 04:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f4bb82fa9e5be080c8d342cbfbc6972c SHA-1: 559a912137df7b0cf7a08bd2151f915581609ca1 SHA-256: a9738008988bd3e9fdd99bb11cb2e1de09f00eaf628be819b2ecc97e1ece0d24
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to a URL that appears to be a keyword-based redirector. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous external links suggests an attempt to direct users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wb?keyword=beginners%20guide%20to%20investing%20in%20india PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388050/normal_5ffca6b86a524.pdfIn PDF document text
    • https://kezagoguz.weebly.com/uploads/1/3/4/1/134131769/xuzilezewevur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fce72855b8e2.pdfIn PDF document text
    • http://alisaborodaenko.design/download_getty_images_without_watermark_2018b0qvf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424666/normal_5fd1fc747467e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417206/normal_600afe10c5c7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387817/normal_5fd05fa31614e.pdfIn PDF document text
    • http://health2health.online/bomokurvf122.pdfIn PDF document text
    • http://ca-manalapan.space/werenex3p4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5ff2267329c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_600d5d81c6643.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485818/normal_5fcd0d145c043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389606/normal_600771af171ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470533/normal_5fe598174863b.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/be40a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490515/normal_60033c79462b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5fd821cd827b9.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/vogubivajavofu/pufubuxejazupa.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/q_acoustics_concept_20_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/85272914836.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_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 5072 bytes
SHA-256: e2c88a371d541596b2a344521b010a0a535f6728285237aaa5e79f783545603f
font_01_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 10864 bytes
SHA-256: c04c6e34d417bcfd5d769ea570afac1aca55d60e3dbd765109cb57a0fbc7b0dd

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