Malicious PDF — malware analysis report

Static analysis result for SHA-256 488bb640e608f606…

MALICIOUS

PDF

75.0 KB Created: 2021-03-30 19:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 079a924fe153e203441f901eac3198e0 SHA-1: 28464787ede3bd9b6bb2e419b75b231062944974 SHA-256: 488bb640e608f60605e92699c78d8bb9c882496dbe096ee1aaa4eadc01f0a855
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to redirect users to potentially malicious sites. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate structure for hosting many external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=eular+gout+guidelines+2016 PDF link annotation
    • http://wuroguredogir.getenjoyment.net/46697823831.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/2iiifm3/monujapij.pdfIn PDF document text
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/4405527.pdfIn PDF document text
    • https://cdn.sqhk.co/vudemijugamu/ihgdtaP/manilonobuxoxidavam.pdfIn PDF document text
    • http://golobupovi.22web.org/bmr_full_form_in_refrigerator.pdfIn PDF document text
    • https://tikobivit.weebly.com/uploads/1/3/1/3/131382680/4e8e9407.pdfIn PDF document text
    • https://kifelulamexeb.weebly.com/uploads/1/3/4/3/134310841/mipigesix.pdfIn PDF document text
    • http://fizarumokugafu.mywebcommunity.org/dobusot.pdfIn PDF document text
    • https://nejotadig.weebly.com/uploads/1/3/1/1/131164569/983519e14ab5b9.pdfIn PDF document text
    • http://zokorut.iblogger.org/26097418222.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/wwiexgi/24555184280.pdfIn PDF document text
    • https://remezimivof.weebly.com/uploads/1/3/4/5/134582621/mewarepe_bopexad_perasi_bopabeboli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jewuwururutaf.epizy.com/ragulifujovozobeful.pdfIn PDF document text
    • http://renewagarumu.epizy.com/html5_template_themeforest.pdfIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_5fe4634b922e43068f33d0abedc70301.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_f594efa9a9374ff2ab7deb0b0a1a14d6.pdf?index=trueIn PDF document text
    • http://koduwutuvage.onlinewebshop.net/67605467624.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_d0a2ce032d8d4ad8a1943d29cb19fae1.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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 5432 bytes
SHA-256: 3aba27170d6510eb574ba0108955b3789d91f62643bd7b112f1826b5548edc44
font_01_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 9972 bytes
SHA-256: af27e469722f752da7e2c6c662872c93928a0faa2b4674e9a6e83d516ebeda63

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