Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c2869bd37e98bb…

MALICIOUS

PDF

72.2 KB Created: 2021-03-26 18:17:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fe9cdebe298c19444079d88022dcb81e SHA-1: c58c3b26ca959ef6df16f042b4bf7b91e6a3e352 SHA-256: 96c2869bd37e98bb025a7fce179beaf2483f0fadbf9b632a236a78b01b43fc95
244 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It contains a significant number of embedded links, many pointing to disposable domains and redirector infrastructure, suggesting a link farm or phishing lure. The presence of a link to a known malicious redirector and the overall structure strongly indicate an attempt to lead users to malicious websites.

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
  • 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.
  • 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.
  • 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/123?utm_term=alaipayuthey+mangalyam+ringtone In PDF document text
    • http://vebilodugisugod.iblogger.org/munaze.pdfIn PDF document text
    • https://cdn.sqhk.co/jidevumedure/hbigQic/sisad.pdfIn PDF document text
    • https://cdn.sqhk.co/duxevowoli/hjaSUji/47798331050.pdfIn PDF document text
    • https://cdn.sqhk.co/nuditufu/l0gdC4y/xbox_one_gaming_monitor_settings.pdfIn PDF document text
    • https://vusowixaxepuw.weebly.com/uploads/1/3/1/3/131381533/2112641.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/hgjjePd/9790127724.pdfIn PDF document text
    • https://nofawubepugo.weebly.com/uploads/1/3/4/3/134373843/b9ecf281b.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/hcMxjbc/vositigetejarad.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/wupixufekijax/51080034881.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/access_florida_medicaid_forms.pdfIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_1a7bad3532154e7eacc8de43374416ce.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_b5bffd70327543e7807c026ec0a4fb88.pdf?index=trueIn PDF document text
    • http://wapuzega.rf.gd/can_t_buy_me_love_movie_online.pdfIn PDF document text
    • http://kogosiji.epizy.com/1115845930.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_010b0ad57a24425da47b0785eb11e9c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegozegi/chronicles_of_ancient_darkness_book_4.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/metallica_nothing_else_matters_guitar_solo_tab.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_off0000dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 5148 bytes
SHA-256: 98ed3769145b25b8ea9b5884e42afd1ca96b6a9c7e29e5006b6507d8789f87c1
font_01_sfnt_off0000ee6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6D 11164 bytes
SHA-256: ce0006adbf68ee7c51d00b4853a5b42138163fef45a27b79fced74f93f5e5fff

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