Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f52d6b7bcdaeeb…

MALICIOUS

PDF

61.9 KB Created: 2020-12-17 05:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 175b77e49b323d0eca831c1f43724e82 SHA-1: 99db320b767114cb1c6266aa46a584ace2f12a04 SHA-256: e5f52d6b7bcdaeeb6823aad21acf859a7376bced3c24bcb59ad4c5c520ad86a5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/123?utm_term=inspiron+2020+ram+upgrade PDF link annotation
    • https://diwixovejawi.weebly.com/uploads/1/3/4/3/134316523/piwefirupiwomud_rowixolofogule_rejul.pdfIn PDF document text
    • https://didizotaxudip.weebly.com/uploads/1/3/4/6/134619455/galegoxaki_wutafotexir_sarajejefuzilu.pdfIn PDF document text
    • https://nejufolij.weebly.com/uploads/1/3/4/8/134883139/desujemigexe.pdfIn PDF document text
    • https://zipazoraxegav.weebly.com/uploads/1/3/4/3/134325660/pikeniwo-rumubizux-fitag.pdfIn PDF document text
    • https://fojumujitugesi.weebly.com/uploads/1/3/4/6/134688065/7329165.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/94bd6e2d-858d-448e-96e2-66d790ee5430/serta_icomfort_i5000_office_chair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ef33d9-a2d9-47dc-93ea-372acb952d6b/68144891500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7db487-a480-44e3-9e54-99ded58d5f57/43472279159.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/aoc_c24g1_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5acdedfe-cad1-4049-a798-c5df7b75f80c/57119649757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6459c4d8-95ed-4015-8102-ce2b8419dc04/jabedadolovusix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a866a892-afd6-4118-97e4-4560b0055187/pocion_de_despertares.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_off0000b506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB506 5456 bytes
SHA-256: efb12bf57f573e02fab08eba6b9e652410177816433e37730cdc32cf18b0bbc3
font_01_sfnt_off0000c780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC780 10356 bytes
SHA-256: b9b28274b09835a6d4726c4c003dc1160656f19510641d8e1c2399b05469603b

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