Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8711a80ed13d21…

MALICIOUS

PDF

86.1 KB Created: 2021-05-21 05:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 47f7c025e6d17f8ff8854a57e51cce8a SHA-1: 15bc81f0262fab3b6abb06344cb16027eec8e021 SHA-256: 6d8711a80ed13d210784965871b4a0b7ab5f4680dd82ffa894c765a619628ddb
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 0.9997

Heuristics 6

  • 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.
  • 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://leonvi.ru/strik?utm_term=double+column+cash+book+questions+and+answers+pdf PDF link annotation
    • https://lowobuganigazo.weebly.com/uploads/1/3/1/1/131163610/f1982d59148b.pdfIn PDF document text
    • https://xemalijojododud.weebly.com/uploads/1/3/0/9/130969235/xatazojowu-natetupojeseb.pdfIn PDF document text
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/9871185.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/takurugilij/chapter_38_angiosperm_reproduction_and_biotechnology_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/smart_av_antivirus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc92a4b-a00d-4dd2-92d4-5b5ed1795507/how_much_does_mobile_dent_repair_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d91bcea-84e4-4543-8839-93245facb56b/jireroxixunegufo.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/diablo_3_guide_witch_doctor.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/dark_souls_2_boss_weapons_for_sorcerer.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/2524364079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/762b74d2-ab94-4cf5-a192-c95d281d7f08/dyson_ball_vacuum_ratings.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/mexaluke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27daa887-f2d7-4857-8db5-91734eb12ec6/how_to_use_nuwave_air_fryer_french_fries.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/3941120158.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 5816 bytes
SHA-256: d9630502d63626b085e8d3af0b2178750257728ecaa1d51469a7f75b6522dc74
font_01_sfnt_off00010e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 11504 bytes
SHA-256: 6102a78027766a1ad257b871ab721d2f213331153926b3d29f416f030c60e3ec
font_02_sfnt_off00013582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13582 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6

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