Malicious PDF — malware analysis report

Static analysis result for SHA-256 5809af103dbc53c4…

MALICIOUS

PDF

88.7 KB Created: 2021-04-04 21:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 90138bfda0fa28780191be0aa0f2fdb1 SHA-1: 46531a766550bb3aeeaffc61193839cd74592788 SHA-256: 5809af103dbc53c4965a5156632a538d198160e455400dff2085d9d42c9e4eef
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, indicating a high likelihood of malicious intent. The heuristic firings reveal it functions as a link farm, embedding numerous external URLs, with a primary lure related to 'Photoshop banner size template'. While no scripts were extracted, the PDF structure and extensive external links suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=photoshop+banner+size+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481684/normal_602a0a605c435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_604ab457b848f.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/ijbCiea/free_inventory_management_excel_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_601af87aab21f.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/netgear_dgn2200v2_change_ip_address.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411714/normal_602eba7f6e264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_604a620be7b47.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/gNfidhb/30947054736.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/ijribkD/rutakugumitaxiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471941/normal_6056066477527.pdfIn PDF document text
    • http://bovibuvebus.getenjoyment.net/guzewadepagivafi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418746/normal_5fee0353da3f0.pdfIn PDF document text
    • https://javekulu.weebly.com/uploads/1/3/1/8/131872149/refumupiripodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464056/normal_5fd0981720b74.pdfIn PDF document text
    • https://biwimukapol.weebly.com/uploads/1/3/1/3/131398517/tatipatuzefax.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/jcvrhbc/86294295138.pdfIn PDF document text
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/tazumumasun.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/rodakumepav.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/60774630491.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_a123eab4760f447f94abc8cdedb4cc1b.pdf?index=trueIn PDF document text
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_5b10e3573b1143499074cce4ffd96c5f.pdf?index=trueIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_9a583fb6d9284256a730e3b4673e0967.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_off00011d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 5248 bytes
SHA-256: 6d43f9289716d466dc26a2b5689592842fe51bbf5c480b52dbda1b359cbab77b
font_01_sfnt_off00012ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC3 11824 bytes
SHA-256: 09e1e95f78e2ec78e62c2b2cac8ca0fd7ee835f2c7ddb42aafba7382310ef8a2