Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e5c6fdea56069c…

MALICIOUS

PDF

77.2 KB Created: 2021-03-19 09:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 710368d45d22f3d210b00304c7f58a28 SHA-1: ebc03063d5828f882951145d972acbb54d9ac199 SHA-256: a2e5c6fdea56069c5d62973b77aed92764b29271c95d7d588e26c745c9a136aa
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. One notable URL is https://dugedepap.ru/strik?utm_term=antec+900+specs, which is likely part of the malicious infrastructure. The document body is heavily obfuscated and contains metadata related to wkhtmltopdf, indicating it might be a generated document used for malicious purposes.

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://dugedepap.ru/strik?utm_term=antec+900+specs PDF link annotation
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/fcbfff.pdfIn PDF document text
    • http://takaweri.mywebcommunity.org/82459182198.pdfIn PDF document text
    • https://xorusisu.weebly.com/uploads/1/3/4/3/134314808/gebofuvebovidu.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/9193648879.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/a4f77c040.pdfIn PDF document text
    • https://dezitatukuti.weebly.com/uploads/1/3/5/3/135389988/lonupugesowa_lowakamok_wuxoxapoto_valibopezuze.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/23697403393.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/a757d5e3f45f.pdfIn PDF document text
    • https://kaxesudinebeg.weebly.com/uploads/1/3/1/3/131379803/8390401d.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/72992169174.pdfIn PDF document text
    • https://bubafoxir.weebly.com/uploads/1/3/0/8/130874260/5028395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/vittorio_monti_czardas_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/sokijumefilamibawu.pdfIn PDF document text
    • http://bupalim.atwebpages.com/18411599950.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/fokipokifog.pdfIn PDF document text
    • http://jebowozuguvufot.rf.gd/write_an_inequality_in_slope_intercept_form_for_the_graph_below.pdfIn PDF document text
    • http://riniwipum.rf.gd/57123490449.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29E 4504 bytes
SHA-256: d509e3d32e41d39dbe30080fa26273aeba88815c33344cdb3dfd981583c4079d
font_01_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 11788 bytes
SHA-256: d02bbb42b84ec108f85620d344e035973808166a941833906703d90e595caf83
font_02_sfnt_off000119a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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