Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32f725b55065987…

MALICIOUS

PDF

67.0 KB Created: 2020-11-14 14:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 66b1d2316470db7ad5e8960856062d85 SHA-1: 1ea2a4f5921d50e5f524d9f415cb5f02307e2dbd SHA-256: e32f725b55065987b10fe5759b5f6f8baf40b33d4c2f904d7c41af3759cf5457
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of a malicious redirector suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffmen.ru/strik?utm_term=i+am+her+tribe In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5f8b8f0c56632.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/5984895.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/655ca15c-cb81-4815-8b89-5d400305e3f0/degifusofubone.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/appraisal_feedback_form_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/750ff6f1-e8f9-4433-946e-55a05acab575/my_elms_umd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3727a630-5be9-4010-97a1-351d02f0aa05/dadijotixijokato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ceafa49-1f69-4282-bc69-982fbbbeb3c0/68908199769.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/pdf_split_and_merge_download_free_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d497ae0-b9de-482c-889f-89ef52ef21aa/83909393409.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/tenuwuweje.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/mixefubama.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_off0000cb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB41 4792 bytes
SHA-256: 8d7be2b4a73ffc768e219a50c3bcf681c8d18ba5fdc0b7f3cdbc68339698c85a
font_01_sfnt_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 10744 bytes
SHA-256: 5217f77562abfec90efd474fb80cb040b913e8e619bba550e488c8a9f10a5d47

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