Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fe941a9f2ed55e…

MALICIOUS

PDF

77.8 KB Created: 2020-11-20 07:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 876981c75ecda3d6ead020482c111c19 SHA-1: 9510084f3f98fd50d82ccbf947cb174e5812f125 SHA-256: 49fe941a9f2ed55ea5d700e041eaf8816c4c76f7131f0f4f37e1fe972d1130a9
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which is not inherently malicious but can be used to construct malicious PDFs.

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
  • 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://gettraff.ru/123?utm_term=nier+automata+trophy+list In PDF document text
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/ea8f70eda.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/f762ebb210.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/90cae73e-554d-4a07-9e76-2c559f952521/10692961891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be74eac-0ebd-4cb6-b9f3-417b5ef5c1bb/newtons_second_law_worksheet_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad045bc-14d1-4ba0-b98e-474c13b0f928/i_cor_1115_commentary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/934914a1-8373-476e-abe7-0e155bd01e48/79964504996.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/bloomington_lake_idaho_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53df6168-8c98-4ecf-8e71-ef9bbec83bef/20076372296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd00ea66-d3cd-43df-9a6a-9794ca8719f9/73958559186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7733efbf-aeee-4b2b-9251-e9673759cd46/58619676833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4437ae-ab4d-4513-a05b-1f2578c71d93/ksu_club_sports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aef057f1-f0f9-4a16-9953-fad17a23dde6/bupexoneravez.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_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 5132 bytes
SHA-256: a15b7d3010934a4b1754e989967c65b980989b70e52890f514c465eeb3077382
font_01_sfnt_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 10924 bytes
SHA-256: f9c066751cdaa0e41aec18f3e439049975175df4760c68bb5bac4d13cb632f2d

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