Malicious PDF — malware analysis report

Static analysis result for SHA-256 919f4f1995434b2b…

MALICIOUS

PDF

82.1 KB Created: 2021-03-20 05:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a8c6a4c5564f08951f2c0cb8e5abb3ed SHA-1: a33624f7d059269d3e85ffdd25a8642ae48cbd8a SHA-256: 919f4f1995434b2b78d3e4d606f2694dbe5fddc3369260028ebb3a96da663ca4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many hosted on disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The primary purpose appears to be directing users to a network of linked PDFs, potentially for SEO poisoning or to host malicious content.

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
  • 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://pelibifir.ru/award?keyword=farmacos+anticolinergicos+pdf PDF link annotation
    • http://koxelovanalimu.getenjoyment.net/jexozumadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464722/normal_6046e2212d308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382617/normal_600a1881a6170.pdfIn PDF document text
    • https://lukobuguw.weebly.com/uploads/1/3/5/3/135396798/lifijofilerufexoxut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416514/normal_5ff85ce16c8cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5febdadbc2878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_602d72ead5dad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387826/normal_6005f3a4df868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_6036aa6ad57dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425515/normal_5fe01c548c306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_5fd31e8b78903.pdfIn PDF document text
    • https://nawobelif.weebly.com/uploads/1/3/5/3/135307193/9524844.pdfIn PDF document text
    • https://bevarepovorumi.weebly.com/uploads/1/3/2/3/132303359/nabamuvuvafi.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/4724744.pdfIn PDF document text
    • https://nasaperexi.weebly.com/uploads/1/3/5/3/135351481/godelopaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454042/normal_5fd8e8cabadad.pdfIn PDF document text
    • http://ladunosim.sportsontheweb.net/navy_seals_training_base_san_diego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_9cb2f0253ef247b9b15d07fba4123dbc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/4307825159.pdfIn PDF document text
    • https://0c285d22-23c9-487a-94f9-680958a2250f.filesusr.com/ugd/9c43ec_e4019a8d31484e1ab4f1616236919f7f.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_24ccd451a7fb4055a989bf89aafa0c98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fopalew/pete_s_dragon_full_movie_english.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/circuit_of_culture_model.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_708c06cc0e6c4d2eadcfc6379c8d516d.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_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 5432 bytes
SHA-256: d976bf333c665bc6e431125cb15644a93a184b3a62d67291059f72e50ea6047a
font_01_sfnt_off000111de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 12204 bytes
SHA-256: 8b1ffd4c8ac6ce83c2ffe84898bb05847551f3d120c5490583efef930f3e49b9