Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dad31f2914ee275…

MALICIOUS

PDF

112.7 KB Created: 2021-03-11 02:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: be303dae44cf37cf64e413006ef4e702 SHA-1: 24d6da3cf1d72d2fbda933c17f1cee662377562d SHA-256: 3dad31f2914ee275f16f14caad9d4b442e8a6cad6a9e19db7e65b8a773374c1e
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external sites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links, likely intended to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/award?keyword=certificado+de+origen+nafta+pdf PDF link annotation
    • https://cdn.sqhk.co/xetajikok/jbgcidk/bevixiratalimirujoxusa.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/tapapitoba_valanamusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451971/normal_60300defeff7a.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/fjhih6E/80_s_freestyle_music_artists.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454432/normal_6013eba2c9a9c.pdfIn PDF document text
    • https://sivesasa.weebly.com/uploads/1/3/4/6/134669324/fumetufezawenu_pumumawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_601b872c091f8.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/Ziagcgf/mirin_replacement_apple_cider_vinegar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450517/normal_6047bd654f757.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofigeniso/mEOhjgd/84780505522.pdfIn PDF document text
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/xaxulilevuwupidir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_60241a4d5606e.pdfIn PDF document text
    • https://teputire.weebly.com/uploads/1/3/0/8/130813428/tafirelofaxiwu.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/lamuzeta-vizaxube.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/cW3jagi/electrical_calculations_practice_problems.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/0hdYEf1/79151206676.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/15a31.pdfIn PDF document text
    • https://nirixebuwema.weebly.com/uploads/1/3/5/9/135990662/9711964.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_e456704efc054db5bc1f933ffec19f92.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_5b1a7622ce3c4eb2a31ea7fdcc122afe.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_7c8697f862b04459ad6a9755231994be.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_off00017d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D1C 5020 bytes
SHA-256: bbc32540b9f4235262e13c2b3093c5b0c5b365deb21acc13ffe44953cc9c075f
font_01_sfnt_off00018e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E3F 11464 bytes
SHA-256: 83803c226490bfa79f320b9c6bbad276959080074c03ab674524831d1a74c5de