Malicious PDF — malware analysis report

Static analysis result for SHA-256 57177d4ee8e11faf…

MALICIOUS

PDF

61.5 KB Created: 2020-11-24 14:23:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f008a43e08abed185c4c8ffbf9ebd3f8 SHA-1: cc064d2617d896ad38745bdb4f256b2012833b94 SHA-256: 57177d4ee8e11faffcb9fec7efe7b00bd96207531e9e767e0883331c6b0d0f5e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The document body, though heavily obfuscated, suggests a lure related to 'Docusign for salesforce'. The presence of embedded URLs and the ClamAV detection strongly indicate a phishing or malware distribution attempt.

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/aws?utm_term=docusign+for+salesforce+lightning+admin+guide In PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/zutezumow-didebotigusi-lutenemalomug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_5faa3eea157ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_5f99428a23ba9.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/4a468066-891a-49c8-884b-1a13ce7b9a68/non_mutually_exclusive_events_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c7359b-4082-4049-ab97-ab756546f288/xabivepavotedokilu.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/willie_cochran_chicago.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/1969591266.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/lakexujub.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/xogeg.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/97696057460.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/tozopek.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/above_the_barre_iowa.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/geektyper_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/14642027291.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/64590267838.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/accounting_rules_file.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/making_decisions_case_studies_worksheet_answers.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_off0000b2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 5436 bytes
SHA-256: 619ff2099974517940523957b9a2057dbbb80b765313f083617aa3c079b59911
font_01_sfnt_off0000c4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F5 10496 bytes
SHA-256: b149aa1ae9a0a6a19c5f3813e22830739bd4eff7b2bb330bf07714e7397e0071

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