Malicious PDF — malware analysis report

Static analysis result for SHA-256 406b563ccd8b7bba…

MALICIOUS

PDF

76.7 KB Created: 2021-02-15 07:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7a1874d42f93c85361f2f67079458c21 SHA-1: d068e6ce454e400d0713f9613b600de0a1f11ce5 SHA-256: 406b563ccd8b7bbaecb2472dffd08b6d6fad848d075a793b715dcbd937a06945
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to suspicious domains, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to lure users to external sites.

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://jacksth.ru/aws?utm_term=clumsy+ninja+new+version PDF link annotation
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/xuxateviw.pdfIn PDF document text
    • https://tagakokiginozol.weebly.com/uploads/1/3/0/7/130775172/8737009.pdfIn PDF document text
    • http://idealslim-ordina.site/beclometasone_dipropionate_formoterol_fumarate_and_glycopyrronium2e4t4.pdfIn PDF document text
    • https://ginozupil.weebly.com/uploads/1/3/1/4/131411281/nimonililuveti.pdfIn PDF document text
    • http://fruitik.space/strategy_profile_game_theory_exampled42iv.pdfIn PDF document text
    • http://italywow.space/4518924462643qjn.pdfIn PDF document text
    • http://craftsmansmetics.com/tevusexeribelevuzimorqavvk.pdfIn PDF document text
    • http://nesobaka9.xyz/gijimamani6mghj.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/fixuxanuseliser.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/tasufagijaremo/attendance_register_format_with_in_out_time.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/vaxubenikiwazeguwekose.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/xadajajupijifebowofimilas.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/49758649352.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/piboganusuxijubetepedu.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/koresulugo.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/67960806737.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/cholera_fact_sheet_cdc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 5068 bytes
SHA-256: 59ff3c9a0546f0ecaf57d1253e1cf0b9ccc408ee6660d01483cf9b4795f994c0
font_01_sfnt_off0000e919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 11144 bytes
SHA-256: 9fedac3f227b736cc0469e1c11ada839671aea0ca83d2e9757cdeac8ad9d99e7
font_02_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 16704 bytes
SHA-256: b262724a35de2722cfb01aeeae9bab4bcd4492d3c2fc840fb2ed7959c4f80e84

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