Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c30b780942a72a…

MALICIOUS

PDF

70.1 KB Created: 2021-03-16 06:14:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0ffadd41915995f48bb73cd3ab00827 SHA-1: 297c525368be16fa57643901afada77d75fff52e SHA-256: 63c30b780942a72a0d2cce78c0c8625935057601c2febddbcd482bda8145a0e4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classification point towards malicious activity, likely intended to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://ponafet.ru/wb?keyword=sopa%20de%20letras%20para%20imprimir%20pdf%20portugu%C3%AAs
    • https://vafomelopujoxo.weebly.com/uploads/1/3/4/8/134864043/8300447.pdf
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/zedobe.pdf
    • https://nitesefoxon.weebly.com/uploads/1/3/1/4/131453907/06cd9e1460.pdf
    • https://cdn-cms.f-static.net/uploads/4369771/normal_604a569d5f626.pdf
    • http://fajufoturesu.sportsontheweb.net/97485466648.pdf
    • https://nozitobolilijaz.weebly.com/uploads/1/3/4/4/134473425/nulifudufubi.pdf
    • http://denarop.22web.org/nursing_diagnosis_for_anorectal_malformation.pdf
    • https://cdn-cms.f-static.net/uploads/4458389/normal_6040e00ed9896.pdf
    • http://sazulido.medianewsonline.com/rotasuwefawubakom.pdf
    • https://cdn-cms.f-static.net/uploads/4384469/normal_6032bfc8e854c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mezubivedoxida.epizy.com/nedojinegupat.pdf
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_0ae154ed638b45c6b0278ec209d74213.pdf?index=true
    • http://bisubop.epizy.com/best_seller_books_for_success.pdf
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_78f3e0398f354797b7e0d3f48d643b8a.pdf?index=true
    • https://s3.amazonaws.com/zikeko/94640652129.pdf
    • http://gelilufojoto.rf.gd/gozopuzete.pdf
    • https://s3.amazonaws.com/godoremitiwuja/27045622312.pdf
    • https://s3.amazonaws.com/zosevid/100g_apple_nutrition_information.pdf
    • http://butorinowu.myartsonline.com/kopef.pdf
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_b7c0c00a1f5043caa9ebd0cca2769ffe.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e5.bin
32d1ec8bed5e94e56fc25f6d949daf8e40d369d0c73a6e7b9adb146ffd9f6bf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 5616 bytes
font_01_sfnt_off0000e3a0.bin
f50a525d9299674cde2c8f63a86edf8ef05dc835a0b1099ee13c71c0c7c557d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 11860 bytes

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