Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ef62f314eca779…

MALICIOUS

PDF

73.7 KB Created: 2021-02-12 05:39:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8d9bf7d5324e8dea98eff4c95339ba15 SHA-1: 284af2e2a948f6c674da86487a2f9b0606a1edcd SHA-256: b9ef62f314eca779781331fe755cf4e4993492918d3fa4ae6fef224f25f8b3fb
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large link farm. The ML classifier also strongly indicated maliciousness. The document's structure and embedded links suggest an attempt to redirect users to phishing or malware distribution sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crophysi.ru/wix?keyword=kent+county+register+of+deeds+recording+requirements In PDF document text
    • http://sovetnik53.ru/html_link_to_printtnzhd.pdfIn PDF document text
    • https://sewatebemadog.weebly.com/uploads/1/3/1/1/131164437/7a763b.pdfIn PDF document text
    • https://litazivufili.weebly.com/uploads/1/3/4/3/134305244/vedirewazopumo-gipiwo-bariwuti-xadedekup.pdfIn PDF document text
    • https://fuwupizur.weebly.com/uploads/1/3/5/3/135390256/b50bea.pdfIn PDF document text
    • https://wijugola.weebly.com/uploads/1/3/2/3/132303023/pomobumar.pdfIn PDF document text
    • http://remont-kholodilnikov.website/vavinevofozcve7z.pdfIn PDF document text
    • http://beamorem.com/titanic_trke_dublaj_indirt8ac1.pdfIn PDF document text
    • https://bojetenabadi.weebly.com/uploads/1/3/5/3/135394614/sawob.pdfIn PDF document text
    • https://karezolakep.weebly.com/uploads/1/3/1/3/131398125/kowekuwi_bazugali_lorolafavura_misepobobu.pdfIn PDF document text
    • http://daravto18.ru/49457599236cn3hn.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/4504693.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/zerepuzuze/framework_3._5_full_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/rewafu.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/melififanevanajofazotewif.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/advanced_english_test_teleperformance.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/41603116263.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_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 5296 bytes
SHA-256: 5c57ca2646b033f18b502c497661bb11e70ee11a0f15cdf599acf4600e3f55c4
font_01_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 10540 bytes
SHA-256: 0e4a96be3efe95f4cb32a13091421111b99e5e66a1970425c842ca4ccd749b0a

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