Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc651aca009908e…

MALICIOUS

PDF

73.5 KB Created: 2021-02-23 05:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 872889c8cbc1e2cbf8a72f710312d5e9 SHA-1: 12a70ff3f12efc4c840f1adc670511d3f6f02d23 SHA-256: 7fc651aca009908e94da886761ba5c9ff390f360295d80a8058752d713bb4175
156 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. 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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=average+sat+subject+test+scores+for+harvard PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485149/normal_601fd393a7e08.pdfIn PDF document text
    • https://kuwiliwal.weebly.com/uploads/1/3/1/3/131378779/fewonobuxexixi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388422/normal_600903e335d9c.pdfIn PDF document text
    • https://vubopedu.weebly.com/uploads/1/3/6/0/136083963/2238064.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/takimukobu_zejijofuku_pokawemu.pdfIn PDF document text
    • https://rojuligu.weebly.com/uploads/1/3/0/9/130969709/aa5134dc.pdfIn PDF document text
    • https://fusajowaxoxa.weebly.com/uploads/1/3/5/3/135344195/jududepinibivorazije.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367004/normal_5fe0b4a16877b.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/8727840.pdfIn PDF document text
    • https://tazokadenu.weebly.com/uploads/1/3/2/6/132695553/penakumedop.pdfIn PDF document text
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/leramedu.pdfIn PDF document text
    • https://jisawawaxiwibes.weebly.com/uploads/1/3/1/6/131606947/8d4ec3727d5aa3e.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/genukopapovixo/how_do_you_get_unlimited_money_in_gta_5_story_mode.pdfIn PDF document text
    • http://vutafinaragod.rf.gd/banana_pi_m1_plus_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/charles_proxy_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/android_version_10_oneplus_6.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/detrimental_impact_on_performance_flexible_working.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/33022022190.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_off0000e215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 5516 bytes
SHA-256: 052d6e96a17b9e2619ab6f28f99e046b965d57f0d0e76206f456f54246e7027f
font_01_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 10344 bytes
SHA-256: 1e4261553daf1e97270a4d8dce9b251c212b7e0d254306addbc95c3db63a2e61

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