Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95c2676d2d6bc8b…

MALICIOUS

PDF

78.9 KB Created: 2021-02-21 04:52:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 963da26f341cb0aa59509eb9de36ed1a SHA-1: fefedccb1420b1ce748d0a41d4616ef79b065133 SHA-256: a95c2676d2d6bc8b7967e9f02eaf34bde9ea47aa57590b68c7dfd0ba453a4cf0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely employing JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/aws?utm_term=congruent+triangles+and+similar+triangles+worksheet+answers+geometry+if8763+page+36 PDF link annotation
    • https://cdn.sqhk.co/dipewoduge/jfMhhoS/credit_report_hawk_alert.pdfIn PDF document text
    • https://zamovolipizutuj.weebly.com/uploads/1/3/1/0/131070940/7b65aa7f3f00.pdfIn PDF document text
    • https://cdn.sqhk.co/xewebevij/KPsghsJ/raseluxisokure.pdfIn PDF document text
    • http://wumorumomu.22web.org/10215622401.pdfIn PDF document text
    • https://febamepu.weebly.com/uploads/1/3/1/0/131070604/kowotupakuvimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_602452f53862c.pdfIn PDF document text
    • http://detonic-ro.website/kunowiwizasuvomvk0fi.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/ggchhjd/translate_russian_audio_to_english_text.pdfIn PDF document text
    • https://bogezemobazuv.weebly.com/uploads/1/3/1/8/131856224/tutubenurava-fojanoto-lidafosesemab-nezaz.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/ji0hhjj/pagaxezilozato.pdfIn PDF document text
    • https://riwivado.weebly.com/uploads/1/3/0/7/130739124/sixipu.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/kujen.pdfIn PDF document text
    • http://dommasters.site/besifadapapukax0w8zm.pdfIn PDF document text
    • https://latafixewikokaj.weebly.com/uploads/1/3/4/6/134687196/8154558.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/4623107.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xazabivi.epizy.com/7763222678.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD3 6212 bytes
SHA-256: 7a78d71ca191d893003d5193f5ddbb8095905aea9b0aa4ca5071c0144bfd8e2b
font_01_sfnt_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 10796 bytes
SHA-256: 1b9b2932de2924ababb259293ca25b49b7acc24088c5f4d75367358f1a442a5e
font_02_sfnt_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 16208 bytes
SHA-256: 314c85c55222e9c47571dccce4b967dbed516664fd4a23da38c55357a676f718
font_03_sfnt_off00011ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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