Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45d5b0c29deb460…

MALICIOUS

PDF

73.2 KB Created: 2021-03-12 10:03:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f904bffdb281961303b98a16817e58b5 SHA-1: b5e9e86f6d9ab0ae466fbbfc9b082c9b2a6cc566 SHA-256: b45d5b0c29deb460aca9ec6ce74c1cd617b6cc08b7ff41493656a4d588385800
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external sites, many hosted on disposable domains. The document body, though partially corrupted, suggests a lure related to PDF manipulation. The presence of a PDF_SEO_LINK_FARM heuristic firing and ClamAV detection strongly indicates malicious intent, likely to direct users to phishing pages or download further malware.

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://nipisod.ru/award?keyword=fusionner+plusieurs+pdf+en+1+seul PDF link annotation
    • https://pifonexivusefeg.weebly.com/uploads/1/3/1/0/131070190/42a2a1b0f0da.pdfIn PDF document text
    • https://dodaxopaz.weebly.com/uploads/1/3/4/8/134865523/288609ef82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_600e75ba4a752.pdfIn PDF document text
    • https://xowogibudul.weebly.com/uploads/1/3/4/4/134446034/werovad.pdfIn PDF document text
    • https://bilokomomaxin.weebly.com/uploads/1/3/5/3/135397692/xokatifuketo.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/3428682.pdfIn PDF document text
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/wowuwemox.pdfIn PDF document text
    • http://laura-egorova.ru/ligidk5k2o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421224/normal_5fe82647dd142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483856/normal_60147df77052c.pdfIn PDF document text
    • https://rokawutavepuma.weebly.com/uploads/1/3/0/7/130776645/votofaxoruz_mogaxas_totivamuwozit_poxepo.pdfIn PDF document text
    • http://austritkfa.com/nokapesugatox81cxx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383912/normal_5ff206139389b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_5fd7a33f73727.pdfIn PDF document text
    • https://mivezariwib.weebly.com/uploads/1/3/4/5/134582287/2249668.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_0f9ade43138a4e06bbc51c74a6be438f.pdf?index=trueIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_c1729305088544f39960e767b3cd718e.pdf?index=trueIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_ecbf9884ceb744f89ec619111ce91000.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_bf29186e3c3d4b8882668e1dd08b65bd.pdf?index=trueIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_66be8ce5a8794823a484722af30f7c4c.pdf?index=trueIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_8d3650349a0244b98ad6edb87770f38d.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_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 4832 bytes
SHA-256: 3730ccb106b4eb2b02ca3d35331a43cfa7b684388c1d4c98e63e4bf9d126ff07
font_01_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 11128 bytes
SHA-256: 6faaa06cadecc78c8bf22299f3bdca09ee5b86266b6fe8dd2b675bea10392684