Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cf03e80c13eff2…

MALICIOUS

PDF

75.8 KB Created: 2021-02-03 09:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: facc5df442f94f42b92d467974d768d6 SHA-1: 5b34c05f4a16004b7e9e6ae085a989ba22b880a5 SHA-256: 61cf03e80c13eff2b6f4723ed364bd9b9c451c7164d837324c748da0f4afdcc0
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/123?utm_term=task+conditions+and+standards+examples+army PDF link annotation
    • https://vupebuxotilejo.weebly.com/uploads/1/3/0/8/130814562/f657de6c8638cb6.pdfIn PDF document text
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/fadumapogine_ganusunewiku.pdfIn PDF document text
    • https://rofujerejikuf.weebly.com/uploads/1/3/5/3/135388349/dunol.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/8696169.pdfIn PDF document text
    • http://xovekofetovo.66ghz.com/the_water_cycle_worksheet_evaporation_condensation_precipitation.pdfIn PDF document text
    • http://ogranicbio.space/908006429477ig8z.pdfIn PDF document text
    • https://movojedafep.weebly.com/uploads/1/3/0/8/130814843/3708535.pdfIn PDF document text
    • http://fly-drive.online/outbreak_meaning_covid5s7pw.pdfIn PDF document text
    • http://winoorama.website/45838770717l2prc.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/puromulexevl4uu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/baxunaf/ampex_601_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/7351226490.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/xivojadevepizekore.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/hungry_shark_world_mod_apk_apptoko.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/toxodexajalunesavolerile.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/toxonekegulojanowazegul.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/57835344160.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/quadratic_equations_and_inequalities_answer_key.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_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 5400 bytes
SHA-256: 60a1f45a1ea0fb21bb69872b4d41c27cdfa5e8664cf2b8c838f4b7b0c3102069
font_01_sfnt_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 10636 bytes
SHA-256: cfc8118b8bcf65aa911e77b94239cb5db843644c53f0ffecac9de3fff6b39c2a

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