Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1730010d5537967…

MALICIOUS

PDF

67.9 KB Created: 2020-12-05 20:07:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e9b18ecbd35b9279462bbabaee4d0cdf SHA-1: f42d38be4d84b898134ba15cb1f78c0a068a639a SHA-256: e1730010d5537967087414f90197ddfd1bc4bc722584bbd757f49f861b190348
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffnew.ru/123?utm_term=twelve+angry+men+study+guide+answers PDF link annotation
    • https://palalolak.weebly.com/uploads/1/3/4/4/134443088/667252.pdfIn PDF document text
    • https://gepepokomireke.weebly.com/uploads/1/3/4/8/134892048/revaguruxepekosutel.pdfIn PDF document text
    • https://kageketiwef.weebly.com/uploads/1/3/4/5/134581137/bukemapotobudu.pdfIn PDF document text
    • https://nosuxiseliv.weebly.com/uploads/1/3/4/5/134578333/nomukataduxilubuto.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/bde9577e-773a-40cd-b427-59d0d5b95efc/fatozi.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/nfl_super_bowl_tribute_to_kobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab11b246-2866-44d0-b499-431d4385831d/lufipukazefibirabajiron.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/kufikorigokibipunijumuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0e52e6-8115-46f1-9a3a-0d3f446093d9/dizinulodanirinut.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/xuzegod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/660c7360-46e0-4d4f-9b4f-f6f52ebb3d25/85541023503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c503f5-f3a4-4bcd-b605-9f96605c9c68/capitalismo_solidario_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f35dcbe-0ef0-47d0-b273-4613dc809aad/rafurejizofemibuwomin.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/70561566393.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_off0000ce46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE46 5348 bytes
SHA-256: de430e8e8e7988b16b451cb32b4c0d6d584d97921b89b867930b0217ee3a95f0
font_01_sfnt_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 10072 bytes
SHA-256: db3b6064f9df9bc5ee87fbb062b08555350f75345c3f9492a58395e7a40b6e6f

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