Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4cc3615de2b2411…

MALICIOUS

PDF

73.8 KB Created: 2021-04-04 23:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 36d48d64dca4148ac463f23a13ea810d SHA-1: 6f8b19069003d1c5326221b5602b475bc593abde SHA-256: c4cc3615de2b24111ca2f26918e9e1b2e64e60a16bdaa864b0cbbaab85b43eec
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are typical of phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=element+symbols+worksheet+pdf PDF link annotation
    • http://gutibefatidag.medianewsonline.com/apeman_a77_user_manual.pdfIn PDF document text
    • https://dowusezawidi.weebly.com/uploads/1/3/3/9/133997386/8865709.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_5fe5b1c9b0c4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_605d95b673070.pdfIn PDF document text
    • https://kusafowagu.weebly.com/uploads/1/3/1/8/131871480/c26a26.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/44068537975.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/jabidiputumapuwawumonupoj.pdfIn PDF document text
    • https://pitisugokusibim.weebly.com/uploads/1/3/4/4/134445344/fininojekolilina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480382/normal_5ffcab9a7cc53.pdfIn PDF document text
    • https://nifumusogukew.weebly.com/uploads/1/3/4/2/134265343/9559382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476270/normal_602f2e7c44d15.pdfIn PDF document text
    • http://gujolumurufeso.iblogger.org/nukemupefejafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lenixad.epizy.com/muwokugetateporananis.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/what_is_the_opposite_of_the_peter_principle.pdfIn PDF document text
    • http://filoroxesofe.rf.gd/washington_dc_breaking_news_now.pdfIn PDF document text
    • http://bemamexozot.rf.gd/82818761882.pdfIn PDF document text
    • http://disukifas.epizy.com/dot_net_framework_4._5_1_free.pdfIn PDF document text
    • http://roporuti.onlinewebshop.net/31682443223.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/92414783692.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/quadratic_equation_examples_factoring.pdfIn PDF document text
    • http://fowakoleviwamop.onlinewebshop.net/inima_de_piatra_mary_balogh_download.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_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 5428 bytes
SHA-256: 89c989956171529b1a72e376d35ff212957d5adc9dbc2caa2b6fe0ae58fc54f7
font_01_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 10428 bytes
SHA-256: 2d796b724a9e750b995b49e66c1c23f8a6c72ae2b650ae1e143259ae3fc4f676

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