Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ccda18cf72900e…

MALICIOUS

PDF

75.6 KB Created: 2021-04-06 20:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b8d28eaca4bf8cab3d17824432e1490e SHA-1: 5da5606e4890ecf6e4e5e443ceec28ca4ebc1758 SHA-256: c5ccda18cf72900e704dc1252c73c6590ff9328119a0b164faa6a3bc63608289
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 of which point to disposable domains and are likely part of a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links, such as http://luxshop21.site/98121492506eaiv3.pdf, are indicative of a phishing or malware distribution campaign.

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://ponafet.ru/strik?utm_term=2006+gmc+envoy+xl+engine+5.3+l+v8+denali PDF link annotation
    • http://luxshop21.site/98121492506eaiv3.pdfIn PDF document text
    • http://kukushpa.fun/how_to_start_writing_a_good_bookml9bo.pdfIn PDF document text
    • http://gebikomuxe.getenjoyment.net/khordeh_avesta_gujarati.pdfIn PDF document text
    • https://nupiwezorebor.weebly.com/uploads/1/3/4/7/134715096/lageviniwutoze.pdfIn PDF document text
    • http://detonic-deutschland.website/39469628408as7bf.pdfIn PDF document text
    • https://libuxave.weebly.com/uploads/1/3/4/4/134438459/587155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422658/normal_6003603f0f35b.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/what_is_oobelib.log1e8ni.pdfIn PDF document text
    • http://dafesoxexigu.medianewsonline.com/74936404203.pdfIn PDF document text
    • http://ooovseanalizi.ru/5185547346u4cwc.pdfIn PDF document text
    • http://blancop.xyz/gilmour_sprinklers_lifetime_replacementfm7zq.pdfIn PDF document text
    • http://ontrade.top/wodizerepevifb4zr6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_6023cd0b7657f.pdfIn PDF document text
    • https://jugovufepejeja.weebly.com/uploads/1/3/4/6/134611134/610b24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_6052d49d8f9ab.pdfIn PDF document text
    • https://wunanowadile.weebly.com/uploads/1/3/4/6/134600652/lobijolurigidu_memasix_roduj.pdfIn PDF document text
    • http://silujokiz.mypressonline.com/rasefodopirokobewuset.pdfIn PDF document text
    • http://storezone.info/gokenawukoxug7cq16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://504b7f7c-d27d-4f2b-a6eb-e8dc7cf660cf.filesusr.com/ugd/6ba015_17ad2800d69f44f5a0bfa4869c3d2ed8.pdf?index=trueIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/platos_symposium_aristophanes_speech.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_522a5c7444d347b1b84bacb89e6bbdfd.pdf?index=trueIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_221c8c761d234996a76a12d833839f33.pdf?index=trueIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_8bb2da92d7b64c6880596ae84627abb2.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_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 6060 bytes
SHA-256: 7ef059f00a0da0c2fbc9952303ab3241337cee7a10934a9361c8ede77a3ecc41
font_01_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 11244 bytes
SHA-256: af022d9388f7a765dec1aec33cc6ecb332963032bbf1de9d96d3d61536888464