Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5bc0135f3884d5…

MALICIOUS

PDF

99.9 KB Created: 2021-02-16 08:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8aea799d2fe89c5f72754c23fb03557f SHA-1: 8cb72078571d84aa8b51cca59f8f365db49623ae SHA-256: 1f5bc0135f3884d5f24dcea478b7f99c2c45b6cb8ae8a1bb91f27d15c33c357a
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 0.9997

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://leonvi.ru/123?utm_term=java+testing+tutorial PDF link annotation
    • https://cdn.sqhk.co/xelalizogim/1jbGRjj/datomasufamidij.pdfIn PDF document text
    • https://tiketutowiko.weebly.com/uploads/1/3/5/3/135345961/wilorurogu.pdfIn PDF document text
    • https://rosififobagas.weebly.com/uploads/1/3/1/1/131164218/pawefagugijaten.pdfIn PDF document text
    • http://vamixasamuk.22web.org/metformin_hydrochloride_prolonged_release_and_glimepiride_tablets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409425/normal_5fe8725c0f518.pdfIn PDF document text
    • https://linazigamatamab.weebly.com/uploads/1/3/1/8/131856602/pifixanewotaker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466398/normal_5ff80830f1059.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/iijajhM/vex_robotics_2020_robot_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/jgeehcM/acellus_homeschool_app.pdfIn PDF document text
    • https://cdn.sqhk.co/mofisozulud/2Jhilhh/vesaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380237/normal_5ff1593ba5c7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mekonulegipero/padozuxido.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/euromonitor_company_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/64851932281.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/guided_reading_activity_3-_1_us_history.pdfIn PDF document text
    • http://garapaf.epizy.com/80569056744.pdfIn PDF document text
    • http://wanezezigemos.rf.gd/historia_de_la_arquitectura_moderna.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001310c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310C 4784 bytes
SHA-256: ff37b0d9a6b191966d1b676098f99ee6fdb25996255dc51a7317eaba1f976bb2
font_01_sfnt_off0001415c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415C 16504 bytes
SHA-256: fb1333e32e18f14329574f07415edacaf88bd51df75e289c6cc67752e2e2abc6
font_02_sfnt_off0001749c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1749C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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