Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c63bbf41aa210de…

MALICIOUS

PDF

69.4 KB Created: 2020-11-22 05:20:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 557777eaca63cc7195dd620f78155a8c SHA-1: 12f15f3d9b3ff14e59251ba1ecb2d9abf4bb826a SHA-256: 8c63bbf41aa210dec711c072c4edca9b8ba60c29b14cb686df01ec6ead330115
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to the malicious URL. The presence of numerous PDF links, including one pointing to a known malicious redirector, strongly suggests an attempt to direct users to harmful sites, likely for phishing or to download further malware.

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://ggtraff.ru/123?utm_term=haunted+places+in+bethesda+maryland In PDF document text
    • https://zavamemedu.weebly.com/uploads/1/3/4/3/134305249/654213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5f90097cd1bdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8723a498ce8.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/gosifigodasawi-dizowuxu-dazorodeviv-bulapivuzuwile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410953/normal_5f96f93d1b948.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/davubewu/5th_grade_math_eog_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/pearson_interactive_science_grade_6_ohio.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/5936043558.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/munumorinuxote.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/pukedokomosarurivimipul.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/wupuzologezuno.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/episode_prompto_trophy_guide.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_off0000d1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 5516 bytes
SHA-256: 4b3fc11d0c1c2ae1046d6d677fd36b7f452709e28677f8f88b61d71238f66f39
font_01_sfnt_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 10676 bytes
SHA-256: 0dcdcd2c7440b0b471a9e775c134272217541947d0ae9e6be6de23d9be852b18

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