Malicious PDF — malware analysis report

Static analysis result for SHA-256 3993c318e6530cf9…

MALICIOUS

PDF

146.2 KB Created: 2021-03-03 09:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 53d5275671fbf16397f96026b8ca4c6a SHA-1: f9ebc8ff3d3f0999d1bee35f2962bae57078c8a9 SHA-256: 3993c318e6530cf9584c0d5bf96108c635f71538b1e3014329dc07b27c3ee3a5
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 designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to lead users to malicious sites.

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://zajinet.ru/123?utm_term=fisher+paykel+dd603+parts+list PDF link annotation
    • https://bumufufumobumag.weebly.com/uploads/1/3/2/8/132815806/saxas-jizekebolekek-piferefe-wakuzemuzetax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379960/normal_5ff8632e6349d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418391/normal_5fd91abedd465.pdfIn PDF document text
    • https://danaguvofuboxi.weebly.com/uploads/1/3/5/4/135401293/3122232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_601604f9d26ae.pdfIn PDF document text
    • http://kerefasiputupez.iblogger.org/98388622975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416810/normal_60307f6d0a220.pdfIn PDF document text
    • https://cdn.sqhk.co/wisivelu/k05B3ij/fuzipovimani.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/maxobuzusefap-fimozizuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_5fe6e0602299c.pdfIn PDF document text
    • https://mokoloxove.weebly.com/uploads/1/3/5/2/135299893/fudemup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414851/normal_5ffa27b5289af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://degeluvugo.rf.gd/mastering_vmware_vsphere_6.7_nick_marshall_free_download.pdfIn PDF document text
    • http://nubomozakazir.epizy.com/3992629235.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20285 5628 bytes
SHA-256: 401298b5f0e00730921c41edcc98897982ad5f6de004fc67d9766d76f6d8ae00
font_01_sfnt_off000215b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215B0 11312 bytes
SHA-256: 415e17b515a60ceb45fcab655b5707895316f4cdda567a8f83863835909ce94f

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