Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5be618c49b486f8…

MALICIOUS

PDF

71.0 KB Created: 2021-02-19 00:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9cd6e813b31727866eb69e05f9210265 SHA-1: ed9b467f9afde55bd676319db1ce74f4fcc06b2d SHA-256: a5be618c49b486f8d1d7983bf7d7d15b677a4fdeaee30661badbcb4dfe5d4197
186 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 0.9998

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://baarspo.ru/strik?utm_term=lg+tromm+washer+le+code+repair PDF link annotation
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/6711922.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/23153718ed7b3d.pdfIn PDF document text
    • http://givotovujoded.22web.org/4227043037.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/xikugap.pdfIn PDF document text
    • http://gabutetidik.22web.org/aol_outgoing_mail_server_settings_android.pdfIn PDF document text
    • https://kobawepa.weebly.com/uploads/1/3/1/0/131070010/6670241.pdfIn PDF document text
    • https://pawudovavumub.weebly.com/uploads/1/3/1/4/131411600/litupavis_sikegodepedo_woxevuvevijot.pdfIn PDF document text
    • https://sugokumorol.weebly.com/uploads/1/3/1/4/131437576/dizegote.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/Ajbidgh/99029154321.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474170/normal_6006e7dd8c135.pdfIn PDF document text
    • https://ledegukumimajem.weebly.com/uploads/1/3/5/3/135393042/dezinapagupeki_piwusalepir_maluf_segif.pdfIn PDF document text
    • https://rujafamuzesoka.weebly.com/uploads/1/3/5/3/135339602/e4ef5f064819.pdfIn PDF document text
    • http://datulosuwila.iblogger.org/zuvetapugutulepexup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezukovurarugor.rf.gd/96150360593.pdfIn PDF document text
    • http://lirinuguwe.rf.gd/brindisi_report_incidente_ferroviario.pdfIn PDF document text
    • http://gokozir.rf.gd/way_back_home_piano_sheet_musescore.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_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 5520 bytes
SHA-256: 3fe3f355f60ae4fbf44604a5b66e6deaaa23afd48ac9fbf950e6352fef3a5c88
font_01_sfnt_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 10536 bytes
SHA-256: c0bdb00169e66b5671bb26ad1b0f96ce9d0d77e3856368496331db8aacf2efce

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