Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8a3b77c951282b…

MALICIOUS

PDF

103.2 KB Created: 2021-03-17 01:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 659e53d51d5d3ec0ebb891cad6b00805 SHA-1: 2b9a296cd9523d6f690046541a1d1fc951ed301f SHA-256: 6e8a3b77c951282b45c7908ee8dd9191abaef3c70e4233f8326be0df5c2c1c57
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggests a phishing or link-farming scheme designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct textual lure is discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/strik?utm_term=is+differential+calculus+hard PDF link annotation
    • http://reassurez-moi-fr.info/basic_algebraic_expressiont7o7c.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikuzi/6zRjfYh/94423740038.pdfIn PDF document text
    • http://gaydating.world/how_to_tell_if_you_have_a_c4_transmissionnaund.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwibinewife/FjeaKjb/cisco_networking_academy_curriculum_5._0.pdfIn PDF document text
    • https://cdn.sqhk.co/xedomobedusi/aghhehj/xekufuvumoxidikofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_604b2578dc3ce.pdfIn PDF document text
    • http://kupatavosapulo.22web.org/debian_server_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375071/normal_603ba4544febc.pdfIn PDF document text
    • http://hookup755.fun/death_note_2017_l_real_nameehux5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwifesatikebak.epizy.com/dugoruxulikorekoreguwori.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/93589352946.pdfIn PDF document text
    • http://zovameden.rf.gd/gunotukesa.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/68394739816.pdfIn PDF document text
    • http://webidiwotew.epizy.com/gobododikufalidojubob.pdfIn PDF document text
    • http://ritarejameja.epizy.com/26065144188.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/reporte_de_averias_movistar_peru.pdfIn PDF document text
    • http://waxetip.rf.gd/earthing_sheet_australia.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13020 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off00013a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A63 5048 bytes
SHA-256: 9f363b0de00fb220121240565a8a36fec08207c7f991a70959911c11c192dc79
font_02_sfnt_off00014b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B84 13560 bytes
SHA-256: ac62782a92c8d07203073b41d8d435266f4b64d4953907aba8bc3ff03f5ef4f8
font_03_sfnt_off00017812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17812 16232 bytes
SHA-256: 8a61b859cb48289fd03cdd8d9300ef032145bdf72d2c2c1eaead36a3c643c998

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