Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f7a3142f57a6b3…

MALICIOUS

PDF

126.0 KB Created: 2021-01-05 21:25:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b996af83be77aa463e4a4f1b6a7ea2e5 SHA-1: d61577a0a9af8280dbfcf61d91e1f00b237cd5fc SHA-256: 47f7a3142f57a6b3b67544acc7fe9237ef4a18e731551b30305b19a88baff669
214 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and a machine learning classifier, and it contains a critical heuristic firing for linking to known malicious redirector infrastructure. The PDF also exhibits characteristics of a link farm, with numerous external links, suggesting an attempt to drive traffic to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=henning+von+tresckow+zitate In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414169/normal_5fb8b34f6c1f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_5fe6b09ad8a1e.pdfIn PDF document text
    • https://tanoviruxejalun.weebly.com/uploads/1/3/0/7/130775892/jizepabamaguzokupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_5fae0fa9618c4.pdfIn PDF document text
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/tezejosaxitoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5fd898cf2f694.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384307/normal_5fcb75e4b92d1.pdfIn PDF document text
    • https://gatilavim.weebly.com/uploads/1/3/4/3/134391542/robulanitenixe-jupudu-bowexeven.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_5f99d66d5737a.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/wemupajese/gasozazufaletijatowag.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/new_baskerville_font.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/mechanical_waves_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b94023-53a6-4489-af42-2cbcf68dc827/gokivifubezubujumu.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_off0001b127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B127 5160 bytes
SHA-256: c36b6e5f56fc5ec953ffcb1fa3b062906e828e70813cf771ecfdb37f4a3f64d5
font_01_sfnt_off0001c2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2F0 12236 bytes
SHA-256: 566f14f7d53c30401bc4af7dd733f47975b029e65b7c541867608c8100686e3a

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