Malicious PDF — malware analysis report

Static analysis result for SHA-256 e595a0363c5a35a9…

MALICIOUS

PDF

73.8 KB Created: 2021-06-05 09:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 22c35d667d7f68ac2e23f02ee6a31a86 SHA-1: 30891dd7b46596ad104bc8e07cb05fe33c7d74d6 SHA-256: e595a0363c5a35a9b68cb11f4c803b1322deba2945571085ea685bbbd31aae0f
186 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URLs pointing to various PDF files hosted on disposable domains, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/pbw?utm_term=hate+story+3+2015+free+movie+download+hd+720p PDF link annotation
    • https://biwazasidatuf.weebly.com/uploads/1/3/4/3/134373857/93a8d2.pdfIn PDF document text
    • https://tedaliduvif.weebly.com/uploads/1/3/5/9/135957254/bewov.pdfIn PDF document text
    • https://fizakilugoleji.weebly.com/uploads/1/3/1/4/131438405/libiraxexebidav-supizov-tevudemokoniki.pdfIn PDF document text
    • https://webapifupa.weebly.com/uploads/1/3/4/7/134706955/1756349.pdfIn PDF document text
    • https://jugidemavewug.weebly.com/uploads/1/3/4/2/134265355/wepabupega-mimikipebuk-nararirojaxit-vuvazal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448345/normal_60295936e61e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379973/normal_60bacaa63239d.pdfIn PDF document text
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/2fe80b0e1.pdfIn PDF document text
    • https://dawewixorumerix.weebly.com/uploads/1/3/4/6/134633471/2662ba17e.pdfIn PDF document text
    • https://kamemixaj.weebly.com/uploads/1/3/4/6/134646558/piruxij-sapefaraxet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_604ddd3e58e4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_605d7f9ecc2ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5fe4cae5aa069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527164/normal_605ca5e7d0b61.pdfIn PDF document text
    • https://ribugasa.weebly.com/uploads/1/3/6/0/136053023/wudakigasav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489583/normal_603bf17a9b436.pdfIn PDF document text
    • https://mipijipibax.weebly.com/uploads/1/3/4/8/134873473/pazidetuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lulimogosan.pbworks.com/f/69463094457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67dbe6d7-1d4b-4042-92c5-50f80559b0a2/47424963787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24adde18-a025-473c-a7a0-1dc2c56a9003/duxel.pdfIn PDF document text
    • http://gexufak.pbworks.com/f/mirapizalexaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e53edb-318e-4ed4-83c7-a6aa92e5d1fc/14165849882.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144425370/does_total_fitness_do_nhs_discount.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_off0000e017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 6192 bytes
SHA-256: e5002d85472aa797c484a2c2c3edd97907b68f016edb1e17be1f043e43055318
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 10660 bytes
SHA-256: ecd749df0c7046f400141f5956e7ca63e95cb6b8725dae1bf25bdf93e5352153