Malicious PDF — malware analysis report

Static analysis result for SHA-256 f108ee53548b0a6a…

MALICIOUS

PDF

65.8 KB Created: 2021-02-24 16:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d56a2711c1854fcd712707c7f3d72895 SHA-1: 413b8e85a93ca461a5737e45355abcc388f6de78 SHA-256: f108ee53548b0a6a9ee638e42197bdddd5dcdb6ab4556dd752434c9d49f1f6d4
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the sample as a link farm on disposable hosting, further supporting this. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=atem+network+setup PDF link annotation
    • http://opticsystem.website/92608538679tb2dp.pdfIn PDF document text
    • https://zokofefedepop.weebly.com/uploads/1/3/1/4/131437243/1877956.pdfIn PDF document text
    • http://febirag.iblogger.org/zivituvu.pdfIn PDF document text
    • https://wizisenax.weebly.com/uploads/1/3/4/3/134320615/5350038.pdfIn PDF document text
    • https://rimozaruminipa.weebly.com/uploads/1/3/5/3/135391391/mikowanugilavu.pdfIn PDF document text
    • http://zedanipon.iblogger.org/pupawilir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xelidev.rf.gd/accounting_aging_report_example.pdfIn PDF document text
    • http://buwobazakosujo.rf.gd/roruvizigafekididotalu.pdfIn PDF document text
    • http://sufizewuwavibu.epizy.com/fronius_primo_3._0-_1_datasheet.pdfIn PDF document text
    • http://xuvagakinev.rf.gd/1708111336.pdfIn PDF document text
    • http://momerizimapunu.epizy.com/lurevufipenijuwutasas.pdfIn PDF document text
    • http://ditajizuru.rf.gd/patonagit.pdfIn PDF document text
    • http://wafogaz.rf.gd/odisha_map_app.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FF 4868 bytes
SHA-256: 653212d15a4e9c85478b5b0d4419639017a8da556d9516b86860dcc16f0917e0
font_01_sfnt_off0000d28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 12228 bytes
SHA-256: c8bba473e5a2488ec57fd9ff5742c6b51cb36de352a272ea746c7f8af34ba80f

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