Malicious PDF — malware analysis report

Static analysis result for SHA-256 4991b3f4a0f38fdc…

MALICIOUS

PDF

80.7 KB Created: 2021-05-24 11:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d71175d5b4e29b52e09e4e41c8942389 SHA-1: 53297d57c7d70ec14e3f48b7c5c8f17f2ab62030 SHA-256: 4991b3f4a0f38fdc9af8a2863b67f98eac9e9e0ff5878023f7d7e401b47c664d
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, suggesting a link farm or phishing campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+calculate+pv+annuity+due+in+excel In PDF document text
    • https://poxemitiwafu.weebly.com/uploads/1/3/1/8/131871555/potumitavixivif-buxotoxedag.pdfIn PDF document text
    • https://figagukedeliv.weebly.com/uploads/1/3/4/0/134040575/ccdf5.pdfIn PDF document text
    • https://nixodogal.weebly.com/uploads/1/3/0/7/130739919/5601891.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/muramokuzunem.pdfIn PDF document text
    • https://vunorozixu.weebly.com/uploads/1/3/1/1/131163876/8372868.pdfIn PDF document text
    • https://dawujorukola.weebly.com/uploads/1/3/4/6/134683436/tinuzabegevil.pdfIn PDF document text
    • https://depujoseteg.weebly.com/uploads/1/3/5/3/135309287/kedofu.pdfIn PDF document text
    • https://lowarimubabop.weebly.com/uploads/1/3/4/7/134712264/5660820.pdfIn PDF document text
    • https://gutazalofekeva.weebly.com/uploads/1/3/5/3/135395177/rotowe-kesusomuxa.pdfIn PDF document text
    • https://ritosameb.weebly.com/uploads/1/3/4/2/134266106/8575002.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/25fc774f-d46c-4893-8bfa-0d815b61296b/how_to_get_hired_at_ross.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0af47a87-96d3-425d-90af-465f353ae6ef/sarozawulefogafar.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/amounts_owed_to_creditors_are_reported_as.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/922bb69f-58cd-4d64-980a-e5e93daca514/mosemexubezubajame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2f9c5c-f911-40a1-9e62-ff6c49452e51/18200219686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1cae51-5b44-4142-a9eb-08a3b450a2e8/to_be_better_than_synonym.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/pawufexuwazujidaxibejiba.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/comparing_two_spreadsheets_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae35cc2-b7cf-43df-baca-d9ba35514d61/gtx_970_vs_rx_580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6854cbc8-6f9c-47af-b932-a48bb7feb5a1/what_were_the_causes_of_the_treaty_of_guadalupe_hidalgo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c93a277a-8de5-4da0-9101-c8544dec85ae/venn_diagram_maths_questions_in_hindi.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_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 5076 bytes
SHA-256: a80b532fdffa2fda41a87cc80c228f2a087352b8b29ea5d069287611f37ba8dc
font_01_sfnt_off00010e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 11304 bytes
SHA-256: 24b69ed9ab114f6293a5cf9b147b21416bd28f8b6dddc52169dd585c840b613a

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