Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac130b09db57e074…

MALICIOUS

PDF

80.9 KB Created: 2021-06-10 15:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3e695681ef3e3addaa9463173600aee5 SHA-1: e00caee9911935a69e8c39038ccd6b1cd674a4bb SHA-256: ac130b09db57e0746ffbd9761759f1b54ab882514add0a97bdf6a47beb8b1c8d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, suggesting a link farm designed to direct users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the link farm and the ML classifier's output suggest it is intended to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://medvor.ru/pbw?utm_term=kinesthetic+math+activities+for+high+school PDF link annotation
    • https://fuzuvetidodevik.weebly.com/uploads/1/3/4/6/134637128/goxonoti.pdfIn PDF document text
    • https://xorusisu.weebly.com/uploads/1/3/4/3/134314808/6b65d28aedae.pdfIn PDF document text
    • https://tefuledajejus.weebly.com/uploads/1/3/1/4/131437322/d605a2d.pdfIn PDF document text
    • https://fakegegi.weebly.com/uploads/1/3/5/3/135312823/9749179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484358/normal_604f177f8c45f.pdfIn PDF document text
    • https://tumotasefon.weebly.com/uploads/1/3/5/3/135317172/penonuzajaxi.pdfIn PDF document text
    • https://ritobawen.weebly.com/uploads/1/3/4/4/134486043/0d26187c07.pdfIn PDF document text
    • https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/xaforerowiras.pdfIn PDF document text
    • https://zabebopid.weebly.com/uploads/1/3/4/5/134585494/delavapox-puvupike-xilerazifamolik-xefutalomuwela.pdfIn PDF document text
    • https://xasejudezorakoz.weebly.com/uploads/1/3/0/8/130813307/4f50eb80af0.pdfIn PDF document text
    • https://pudawiwut.weebly.com/uploads/1/3/5/3/135342926/2887297.pdfIn PDF document text
    • https://wivirupi.weebly.com/uploads/1/3/4/6/134666213/5c6c3ddf3ad6dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471682/normal_6032939b6fdee.pdfIn PDF document text
    • https://medimigo.weebly.com/uploads/1/3/4/8/134864966/1357711.pdfIn PDF document text
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/1b65697e7a8.pdfIn PDF document text
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/wazakofotufav.pdfIn PDF document text
    • https://vadizomozizi.weebly.com/uploads/1/3/5/4/135400682/xamakawebevek.pdfIn PDF document text
    • https://mewodufupojapoz.weebly.com/uploads/1/3/1/8/131857890/a89a2b568fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479688/normal_6064916482f43.pdfIn PDF document text
    • https://vadiduriku.weebly.com/uploads/1/3/4/4/134445950/5434187.pdfIn PDF document text
    • https://tajulariti.weebly.com/uploads/1/3/4/8/134863193/4fd5f7b.pdfIn PDF document text
    • https://kenomipijisax.weebly.com/uploads/1/3/3/9/133986884/fadeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_5fe9482c0dbdb.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://uploads.strikinglycdn.com/files/e6922ed7-b1fa-4a1a-9a47-2fcc3aca0f82/zobinet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e52459-7b12-452c-afea-33aae4250d89/adobe_audition_1.5_full_indir_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85864e1-d4ed-477d-9ce2-21d8d898dc32/vifosezidoguxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25a30517-af71-4c66-b126-5ad3bca0815e/tales_of_dunk_and_egg_tv_tropes.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_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 5112 bytes
SHA-256: 6290259d9233919e83c670eae4558cb00185f5c75278ff19a97524bce3e1459a
font_01_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 10620 bytes
SHA-256: d0ca4dbbaf4c0dcc595e6bb0e272bc2a0483ce39f98348957aa6b5d1a8da6664
font_02_sfnt_off000125e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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