Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dc008efe0b816f…

MALICIOUS

PDF

79.2 KB Created: 2021-02-23 07:27:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 28a8b786aa7d90ce82ad23d65c39c387 SHA-1: fb21ce647c068aa36aa3a41d7ada641a66857d7f SHA-256: 23dc008efe0b816feb5d76d62b26f7874d9f37e87dc8317406be6c04b000b960
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The primary URL, 'https://maypoin.ru/strik?utm_term=myers+briggs+letters+a+and+t', suggests a phishing or scam attempt disguised as search results. The presence of multiple external links and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious content or phishing pages.

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
  • 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://maypoin.ru/strik?utm_term=myers+briggs+letters+a+and+t PDF link annotation
    • https://netexebi.weebly.com/uploads/1/3/0/8/130815192/368d4692aabc.pdfIn PDF document text
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/51871ba2dcac585.pdfIn PDF document text
    • https://lotefexikig.weebly.com/uploads/1/3/4/0/134097130/zapubepanizovoxepat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409606/normal_602226a45b815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_602856fd62b2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411932/normal_6010f046e7345.pdfIn PDF document text
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/534704.pdfIn PDF document text
    • http://tinezukozaga.22web.org/15817597514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_6025cf666eea4.pdfIn PDF document text
    • https://piziwola.weebly.com/uploads/1/3/1/3/131382430/vifuxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://werexixudi.rf.gd/wordscapes_answers_level_400.pdfIn PDF document text
    • http://xarozitapakegur.epizy.com/vomaxagolovugimudomibu.pdfIn PDF document text
    • http://wowifimeziv.rf.gd/online_application_form_of_ssc_je_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/wujege.pdfIn PDF document text
    • http://novoniranalisa.epizy.com/budget_control_spreadsheet_example.pdfIn PDF document text
    • http://pabovabavuwemet.rf.gd/nikezitasanevoxevijutu.pdfIn PDF document text
    • http://xivutunitilema.epizy.com/bisaya_songs_free.pdfIn PDF document text
    • http://fiduritunibo.epizy.com/adobe_reader_free_uptodown.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_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 5240 bytes
SHA-256: a85a9ba553367d364dd1cb58fcb3943f1fc8bf87a8a2638ad1d20671332627ad
font_01_sfnt_off00010aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 10884 bytes
SHA-256: 8ac5c24c0baea4989eac6e2e31da0b697e8c7ba2969727fa6d2c1d38f8a44f5f

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