Malicious PDF — malware analysis report

Static analysis result for SHA-256 747036d65483f9cd…

MALICIOUS

PDF

93.9 KB Created: 2021-02-23 03:17:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f5397af1bc7e1ce99c0e85be1ca16677 SHA-1: 5de8b6342662d575fb229d7b09a6dca2c25175cf SHA-256: 747036d65483f9cde5a83e3af1828af0cb6b5f137936d3444b6d6b6f4751bf63
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. The embedded URLs are the primary indicators of compromise, facilitating the distribution of further malicious content or the redirection of users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://leonvi.ru/wix?keyword=2+step+equations+maze+answers PDF link annotation
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/5d312a.pdfIn PDF document text
    • https://vuginavoji.weebly.com/uploads/1/3/0/7/130775358/6e08b8ba5dea0e1.pdfIn PDF document text
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/turobimines.pdfIn PDF document text
    • https://cdn.sqhk.co/futogifoku/ajggjvP/31945222604.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/kDPifEc/fifusipitemirotomatib.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/poxedif.pdfIn PDF document text
    • https://dutosagow.weebly.com/uploads/1/3/0/7/130775111/1296694.pdfIn PDF document text
    • https://petavigavixate.weebly.com/uploads/1/3/4/4/134459614/xabewodutu.pdfIn PDF document text
    • https://gakokoxexoboj.weebly.com/uploads/1/3/0/7/130776672/tonisufev.pdfIn PDF document text
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/9721d1a75b80ed.pdfIn PDF document text
    • https://tujiniwiko.weebly.com/uploads/1/3/5/3/135350236/3439095.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/tivakonokot_jenevikalaroveb_nonega.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/fomugowipo-zuropu-dimaduzojejapi-kogobuxusig.pdfIn PDF document text
    • https://zawamobapuve.weebly.com/uploads/1/3/5/3/135383520/zefatuxoge.pdfIn PDF document text
    • https://zodazapel.weebly.com/uploads/1/3/4/5/134511258/wolalixoxep-jowevi-wedesoxumibov-medexupuli.pdfIn PDF document text
    • https://duxedakaba.weebly.com/uploads/1/3/4/8/134899299/vaxopakusinaz.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/gasodamuza/23861824816.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/scary_granny_baldi_horror_game.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/parent_functions_and_transformations_algebra_2.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00010c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 5240 bytes
SHA-256: 0c1abd4e992348a7f71d63d6641a563c30bf80341287ab4cee9836ad95c31d79
font_02_sfnt_off00012e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 11372 bytes
SHA-256: a31c9d6c250ada0e8070f7ecf18d3d9042d9770d4b83d7d274827f0cf883625d
font_03_sfnt_off000154b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B0 16196 bytes
SHA-256: 09e8e4a8d4340061abfd8730c07bdf0d0ae79f2c2acf13c8ce5b743725213f89

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