Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5ce5fd128bd6a7…

MALICIOUS

PDF

108.2 KB Created: 2021-05-27 03:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 08c3a31826ab462847f8ef6463e01146 SHA-1: 0ff5412a43385a8b1bf17fbe7ad92e23817e65f5 SHA-256: 8a5ce5fd128bd6a78eb55f6b2a35d2be049a5c633a45ea8dd6cda29760438867
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=the+theory+of+moral+sentiments+publisher PDF link annotation
    • https://geroguvipem.weebly.com/uploads/1/3/4/4/134465684/a9dfc50c70f97.pdfIn PDF document text
    • https://ratamugokamilel.weebly.com/uploads/1/3/5/9/135959592/65255631e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417214/normal_5ff21f55ec047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530429/normal_605ae849da87a.pdfIn PDF document text
    • https://kevanosum.weebly.com/uploads/1/3/0/9/130968994/milagigexaz.pdfIn PDF document text
    • https://lewimovi.weebly.com/uploads/1/3/4/3/134311482/7576800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_603bac576ca78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_5fdaef11bf908.pdfIn PDF document text
    • https://mojivisosodarez.weebly.com/uploads/1/3/4/0/134096231/dezido_gugobipene.pdfIn PDF document text
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/2367cd8556a16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414515/normal_5ffb67656d23a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5ff1535669075.pdfIn PDF document text
    • https://vobokalonumenu.weebly.com/uploads/1/3/4/6/134656332/setavuwubu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456984/normal_5ff7b0c172943.pdfIn PDF document text
    • https://vinetiwufo.weebly.com/uploads/1/3/5/3/135305890/7168796.pdfIn PDF document text
    • https://suwanofanezelon.weebly.com/uploads/1/3/1/6/131636577/bogavaluwunuk-wojen.pdfIn PDF document text
    • https://milelujip.weebly.com/uploads/1/3/4/8/134861654/jaxuwosuzedini-zonukemapi-dirakatinu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b274b7bb-e311-4787-91a7-8d48ddc35944/zulodedanixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c541d2e-4b7a-4ad2-8de7-a4e5e7837dda/how_to_fix_windows_10_boot_loop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b86af92-b609-4ff3-95b0-642942930fdc/code_to_program_ge_universal_remote_to_sanyo_tv.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_off000169fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169FD 5332 bytes
SHA-256: 525f66193407b1980ad9e4f319d08683f6f9312c56d6a4e43afae9e13d125470
font_01_sfnt_off00017bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF6 11292 bytes
SHA-256: 28d2015a473ce9246808fa0c292700ffbc1aa998bd31f20b2ae18cdf5d990093

Open this report in the interactive analyzer, or submit your own file for analysis.