Malicious PDF — malware analysis report

Static analysis result for SHA-256 de19e995a39a0de2…

MALICIOUS

PDF

72.7 KB Created: 2021-05-28 05:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c9dccdd06461cf0f7eab353e1e42484d SHA-1: 22627f91b75fa3eb9f3df170b4e2bac52261b4e7 SHA-256: de19e995a39a0de2864c25be43d4e32f62153de8382ddefb3dc7f36ae1c3b772
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, and at least one URL is known to lead to malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=congruent+overlapping+triangles+worksheet In PDF document text
    • https://logosomuzabi.weebly.com/uploads/1/3/0/9/130969340/gusugenen.pdfIn PDF document text
    • https://doxuginuf.weebly.com/uploads/1/3/5/3/135346615/zipukob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474719/normal_5fee67916b99f.pdfIn PDF document text
    • https://joxeluduxena.weebly.com/uploads/1/3/4/7/134772203/zezusomob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445338/normal_60660bd199d81.pdfIn PDF document text
    • https://lerojapozexux.weebly.com/uploads/1/3/4/0/134016693/muvotafoxafi-dovitejedavi-jijepafuvi-fiwefixupepoxo.pdfIn PDF document text
    • https://gekipedagap.weebly.com/uploads/1/3/4/7/134750311/8b5e210e72e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490132/normal_5fe52a508e266.pdfIn PDF document text
    • https://vebokupamo.weebly.com/uploads/1/3/4/4/134494409/5867763.pdfIn PDF document text
    • https://gezixipa.weebly.com/uploads/1/3/4/5/134503119/zezuvebilafiseziji.pdfIn PDF document text
    • https://kebomekol.weebly.com/uploads/1/3/5/3/135349545/divukinenoguris.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378165/normal_600d0be52a7ec.pdfIn PDF document text
    • https://tumirovuwepilu.weebly.com/uploads/1/3/4/6/134603677/7c9500ab4.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/1752610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495860/normal_60535d3f1b519.pdfIn PDF document text
    • https://demujerifusa.weebly.com/uploads/1/3/1/4/131437649/122857.pdfIn PDF document text
    • https://somejenever.weebly.com/uploads/1/3/4/3/134385140/sojelozaj_ribusojogoro.pdfIn PDF document text
    • https://tufizesux.weebly.com/uploads/1/3/4/5/134596030/7532a0b3cdfbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5fe227195a876.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b3458d0-5784-4f0c-84d7-f9c9e234cbbc/neliriluwufosobarizinamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d9e9b0-0d20-4106-bbc1-350c9332d28c/nike_air_force_1_white_and_black_swoosh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d8d903-1724-4d78-91bb-42baef8be9dc/gosabiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82065b87-140f-474f-b4df-dfb924e5f9c4/16727666902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f09b790-cae3-4b50-a319-4f061456d967/our_final_invention_james_barrat.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_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 5200 bytes
SHA-256: edd1e2d9a97b15557466a9ed42992dfb8f2666b54bd529b6504b6b27b31e0be1
font_01_sfnt_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 10164 bytes
SHA-256: f92f96dc39d9605f9277b5c1843defe073b2c66fcdd428c870ee1f92d4f8b069

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