Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ee59abbb486b68…

MALICIOUS

PDF

71.4 KB Created: 2021-01-03 12:27:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7d31d6e4dbb8a2661f5f0668bafc26c1 SHA-1: 6af4412db9bc22ccad461a012f718effa6c112ea SHA-256: 52ee59abbb486b689cbdb821c25d576067a639848dde1fef980abf3121513b1f
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least two identified as malicious redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to harmful infrastructure. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://ggtraff.ru/aws?utm_term=decision+tree+flowchart+template+word In PDF document text
    • https://vaxidavuk.weebly.com/uploads/1/3/4/3/134371973/f8acd8c28dd5b0.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/XhgcoYK/9637744949.pdfIn PDF document text
    • https://bisijonowazupu.weebly.com/uploads/1/3/2/6/132682684/eb0cafcf1.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/aa6b18f6-0a59-4b27-b666-50df43342422/gawuremuwogaxotifi.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/6175763055.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/cardiovascular_system_test_review_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fbe6ddc-27be-4788-a927-a25c8f84af78/50028533609.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/tetamudovunisowelezil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd746b3c-e406-40bd-9d1d-d4ee03b88dd1/35367524124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c786fa-bef2-4539-bea3-1f9beaff5c01/zepelakikesinorenojawevim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf01c28-b9f9-4238-961b-0292d9d36649/kenshi_bounties_go_away.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_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 5484 bytes
SHA-256: 33d07625c3bceaf9cecc31d45507c400c6bcf3db9c4fd6225ac15ca6da36923a
font_01_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 10160 bytes
SHA-256: 3bee967686467e53a51d1168b1f5e6cef36375f0a7532e988816b1335414b8b5

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