Malicious PDF — malware analysis report

Static analysis result for SHA-256 71206726d16e22f8…

MALICIOUS

PDF

79.8 KB Created: 2021-04-04 23:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 89593fa8fe1286ecb8fb81130cee4506 SHA-1: 9f272022ef5ea52412270a533e0097c058ee078d SHA-256: 71206726d16e22f8f68229cd5ef65960b9999c62c9d3228b6a0aa2a8f01c18ed
186 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or potentially download further malware. The embedded URL 'https://midufefew.ru/wix?keyword=oxygen+reduction+reaction+corrosion' is a primary indicator of this malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/wix?keyword=oxygen+reduction+reaction+corrosion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452835/normal_6040da74a1f05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410211/normal_601fe24e8b31b.pdfIn PDF document text
    • https://cdn.sqhk.co/fupupusamun/dicgipr/apkmonk_my_little_pony_ar_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459787/normal_6057d9d12f15c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5fc6a73721ba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408002/normal_600e3fac5c7e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473064/normal_602da0c029ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_60582e3c46f54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462976/normal_5fcb2d1386c1e.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/viufgie/bigawovefirewuregelumana.pdfIn PDF document text
    • http://meleworofazob.22web.org/52663277517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461245/normal_5fe7d63793f21.pdfIn PDF document text
    • https://cdn.sqhk.co/xogudililavo/6FThaEZ/66723941140.pdfIn PDF document text
    • https://cdn.sqhk.co/fovulifavu/hbVMciT/led_air_power_soccer_ball.pdfIn PDF document text
    • https://cdn.sqhk.co/noretokujazo/lLHz70x/66093064205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465400/normal_5ffc3b70de5bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446400/normal_60435b3352818.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://20097937-9b7a-4da4-851c-33e9a8906939.filesusr.com/ugd/1e3518_8d8aa869a30346aaa5b62080a874d5a6.pdf?index=trueIn PDF document text
    • http://gapizaxudokux.epizy.com/57935462452.pdfIn PDF document text
    • http://xofedebowin.epizy.com/video_cutting_software.pdfIn PDF document text
    • http://solobasoridevel.epizy.com/zesor.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_7d921412dcc84d9aa20f3902f1b29f5c.pdf?index=trueIn PDF document text
    • http://namupurifu.epizy.com/28483016286.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_3cf5d36927d54876a0cdfc0feb7a87f0.pdf?index=trueIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_2880d48de9754fa59b284295747e3237.pdf?index=trueIn 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_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 5272 bytes
SHA-256: 09b56929e9c7124fac5082ae34703ea3330a410ecea6d4f8b60549b760d441a7
font_01_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 12080 bytes
SHA-256: 84788feb613cf551f57a68e02cc4bcc40f84c8aa6a64304e2fc28ed70988ec4d