Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c713d5abaae1aa…

MALICIOUS

PDF

83.0 KB Created: 2020-12-26 09:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f762e795576d8bee9a52b942aa4d0352 SHA-1: 514cf0c31db240239902252124fcc566a902de7c SHA-256: 62c713d5abaae1aa599e30ecc455d6267b33f040fffe8b6cbb1f5a2c9986dc1d
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to known malicious redirectors or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest an attempt to redirect the user to malicious content.

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://traffmen.ru/aws?utm_term=letter+of+recommendation+pdf+template In PDF document text
    • https://cdn.sqhk.co/vibifexode/gjjb7b6/graphic_design_print_portfolio_layout.pdfIn PDF document text
    • https://savegisat.weebly.com/uploads/1/3/4/6/134609021/27f1206b.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/1740617.pdfIn PDF document text
    • https://cdn.sqhk.co/larovejadeb/zTjhvbq/does_verizon_cloud_save_text_messages.pdfIn PDF document text
    • https://cdn.sqhk.co/loboremetoxe/fibhi05/space_run_galaxy_gameplay_fr.pdfIn PDF document text
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/sebopatine-sesoj-kekaso-lubumujituforaf.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/xukodomenawam_deturegipemuki_salodip_tosisa.pdfIn PDF document text
    • https://cdn.sqhk.co/wemofisejaf/xjbIYjg/82385413021.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/pubopelej/agreement_letter_format_in_nepali.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/matthew_24_bible_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/wugojaremo.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/zufepozajolafulugup.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/cute_cartoon_coloring_sheets.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_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 5064 bytes
SHA-256: 25b3399c0f5a9afb541bae2542c47e265a354b7fcb98b9de90102238a34f2d2b
font_01_sfnt_off00011a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A38 11036 bytes
SHA-256: 79945555c6316fefc3916cd4097e0593216f0e62974dd9df042edea5b3134a74

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