Malicious PDF — malware analysis report

Static analysis result for SHA-256 6963aaa849d3c5d9…

MALICIOUS

PDF

75.0 KB Created: 2021-05-19 14:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 12a8777ebbc89e84ba766eb9246b8f37 SHA-1: 52774e2aec23f86dcc27937580df45c8b6584da8 SHA-256: 6963aaa849d3c5d96fb7fd3a54a1a3477c98e65940e04af8c34110e816fecb69
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://resalured.ru/strik?utm_term=free+auto+repair+invoice+template+excel PDF link annotation
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/04352011c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413969/normal_604389ff3efe0.pdfIn PDF document text
    • https://wukisusu.weebly.com/uploads/1/3/2/6/132696029/4c18108b3b75.pdfIn PDF document text
    • https://sojebubibofanex.weebly.com/uploads/1/3/4/5/134512436/aa44ec7fcd0.pdfIn PDF document text
    • https://wuliwivopez.weebly.com/uploads/1/3/4/0/134096380/wipaj.pdfIn PDF document text
    • https://monubigikupo.weebly.com/uploads/1/3/4/4/134493781/c359f4c82cf.pdfIn PDF document text
    • https://wakutoji.weebly.com/uploads/1/3/4/3/134314583/5ad3d1e7c62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457272/normal_5ffd2846d8c4e.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/jelugigevera-sufigefulu.pdfIn PDF document text
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/tizuk.pdfIn PDF document text
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/3364187.pdfIn PDF document text
    • https://vopemafewiza.weebly.com/uploads/1/3/1/4/131408930/zepixasomir_desulir.pdfIn PDF document text
    • https://sevimuxeso.weebly.com/uploads/1/3/0/7/130739978/8098456.pdfIn PDF document text
    • https://mitumeme.weebly.com/uploads/1/3/4/8/134879381/nidaj_jagafen.pdfIn PDF document text
    • https://vunusamonumated.weebly.com/uploads/1/3/4/0/134040658/5062318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387573/normal_600afe1557082.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/lukepepe/brother_hl-6180dw_printer_price.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/saserofunivoju.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/27564336186.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/wasteland_survival_guide_fallout_3_robco.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/hp_c309a_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/performance_coaching_log_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/33558597557.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_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 4984 bytes
SHA-256: ba5c05a5ab725c950907be0d2de23a99f548e008cddfac69815fd98422eb9578
font_01_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 10488 bytes
SHA-256: 0baaaecbdfbfd1d6c9d2ef154ffcc3123814914a9c710b00c5b6ed4f470423bd

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