Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6b0762c4823a07…

MALICIOUS

PDF

70.2 KB Created: 2021-02-10 08:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0e9f82433f3d0c6e10abf7b3824da7cf SHA-1: 76a229b6322f7333e3c67c568273b87824ce890e SHA-256: da6b0762c4823a070e9640ec7ff07f5a8ec2f4a0fffe51f76f3c90d36e6384b4
142 Risk Score

Malware Insights

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

The PDF document uses a fake invoice and download button lure to trick the user into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farm heuristics suggest the document is designed to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/aws?utm_term=consultancy+agreement+template+doc PDF link annotation
    • https://cdn.sqhk.co/joraxeneli/PRjgigu/80498971958.pdfIn PDF document text
    • https://ripulufixi.weebly.com/uploads/1/3/5/3/135388512/vexukefaxidesozef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479236/normal_5fe1ab5910ca9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_600909dfc93e1.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/lTiW0gj/mefelifeso.pdfIn PDF document text
    • https://tazerodine.weebly.com/uploads/1/3/4/5/134598813/09e4fb1f.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/jhngePs/kepevetiwevasonujadoseba.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvutose/b7jjAjc/pigivajawix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390069/normal_5fe548b1133c9.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/Ljeggjd/xipazas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_60178bb13895d.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/jdSggBM/free_ringtones_iphone_app_store.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuluputig.epizy.com/82943890378.pdfIn PDF document text
    • http://kufobidup.epizy.com/13239287304.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/vosipeveja.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/57350676699.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/vector_folder_design_template_free.pdfIn PDF document text
    • http://labazorev.rf.gd/the_braggest_font_free.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_off0000d4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EE 5400 bytes
SHA-256: 8b530bf68be8c04ea9a06af0cabfdd7cdad8a342332bdc248ca1775cd345bd8d
font_01_sfnt_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 10752 bytes
SHA-256: f7b16fd6885e7b2803577197a374f8bdc6305e8b6f8fc251966c373ff1c47277

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