Malicious PDF — malware analysis report

Static analysis result for SHA-256 101a6441583acb82…

MALICIOUS

PDF

71.7 KB Created: 2021-02-19 22:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 64f1d670561c126d476ac35d8ae7432c SHA-1: 655eee3326cda46938f4902dc18b5997e43e452e SHA-256: 101a6441583acb82a9c415b32f85cd69fa0e40c66100a251c10d13f15a7d0db0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://seumenha.ru/strik?utm_term=grade+4+math+assessment+worksheets PDF link annotation
    • http://verifedform.com/tratamiento_para_taquicardia_sinusalrkzi3.pdfIn PDF document text
    • http://velesvoyage.ru/automation_studio_freel56c2.pdfIn PDF document text
    • https://gezajinesobovu.weebly.com/uploads/1/3/2/3/132303035/2754053.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/docker_deep_divei0yqs.pdfIn PDF document text
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/aa60b3478.pdfIn PDF document text
    • http://all-host.site/cursos_de_ingls_en_lnea_unam_gratis_2020_con_certificadoksaxx.pdfIn PDF document text
    • http://tramlaweq.online/stunt_bike_race_new_free_games_2020_videoee304.pdfIn PDF document text
    • https://xudorelaguf.weebly.com/uploads/1/3/0/8/130813521/sefipil.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/honda_foreman_service_manualqfbyz.pdfIn PDF document text
    • https://vazejaxos.weebly.com/uploads/1/3/1/3/131382607/487b3780f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xavisijividefo.epizy.com/benexewowipos.pdfIn PDF document text
    • http://sobezoneroli.epizy.com/bibliothcaire_formation__distance.pdfIn PDF document text
    • http://jatodarilale.epizy.com/cbse_class_9_english_beehive_textbook.pdfIn PDF document text
    • http://jedirolin.rf.gd/60529079514.pdfIn PDF document text
    • http://wifepex.rf.gd/74918233703.pdfIn PDF document text
    • http://sutuguve.rf.gd/51873310502.pdfIn PDF document text
    • http://bifobexa.rf.gd/45112022066.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_off0000db71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB71 5308 bytes
SHA-256: 9c41de90bf2a722d4b47e752cc8b08d88bef1168b76e681c9a618dd367abb4f0
font_01_sfnt_off0000ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 10828 bytes
SHA-256: d0acfeb4618cc573a42fc22cdc7ebf342254721c66efc62adb213fc187e12a4b

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