Malicious PDF — malware analysis report

Static analysis result for SHA-256 325e9f9fe63c94b7…

MALICIOUS

PDF

80.9 KB Created: 2021-02-19 23:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 778b7effbcda87282c1e1983bdd7751c SHA-1: 0f202ae09a69c893b3cb4e4df6e6647ec996c571 SHA-256: 325e9f9fe63c94b76ac2893f8215e2eee26b52b72e816925c5e1963f754e778e
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing infrastructure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on potentially untrusted hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is intended to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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://baarspo.ru/wix?keyword=beaked+sea+snake+facts PDF link annotation
    • http://4gusevshop.space/37501970430laqoj.pdfIn PDF document text
    • http://you-bestshop.xyz/bilejepurunun0m24a.pdfIn PDF document text
    • http://antinomi.design/lunowetoq8pex.pdfIn PDF document text
    • http://prolac.ru/zobofalinogutuyk390.pdfIn PDF document text
    • http://digitaloffice24.ru/bigg_boss_13_live_app37l1m.pdfIn PDF document text
    • https://fusagepewaliwe.weebly.com/uploads/1/3/5/3/135325652/c4e253b8ac89639.pdfIn PDF document text
    • http://goldstein.berlin/xisubeebmxj.pdfIn PDF document text
    • http://copyrighthelpptteam.com/caracteristicas_de_una_maquina_termig44gg.pdfIn PDF document text
    • http://english-10.site/32443541273mkyw6.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/aUbJJvw/77352275376.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/1414007276765tw6.pdfIn PDF document text
    • http://fortuneo.biz/cpm_integrated_math_1_answer_key6peh6.pdfIn PDF document text
    • http://summ-green.fun/antibiotics_classification_based_on_spectrumaezua.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/jfVggfj/radiant_definition_francais.pdfIn PDF document text
    • http://momentshop.website/50525605545fgdry.pdfIn PDF document text
    • https://pofexetebi.weebly.com/uploads/1/3/4/5/134592759/dawifuvuwaro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fekobovovexi.epizy.com/contratto_di_appalto_di_servizi.pdfIn PDF document text
    • http://wutogiku.epizy.com/mejinuduselip.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_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 5000 bytes
SHA-256: 97616ef51433fc450ae40b589ebd4d0319f1c4621b79ce02abd35980625f8231
font_01_sfnt_off00011192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11192 10872 bytes
SHA-256: 2f8b9c57f8bf8ecc88429f3bbe867cf47c56ea8e4e30bc62df0ef7bcabfd64b2

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