Malicious PDF — malware analysis report

Static analysis result for SHA-256 665299399f034088…

MALICIOUS

PDF

74.1 KB Created: 2020-12-25 23:26:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c8582815bffe9ed98dfd87e179f05606 SHA-1: dd95f7338cc1dc7a82027c8e3cd4ecd98e9ba74a SHA-256: 665299399f034088480041f7f0e3f3cee787542762267ed744aed39f946eb11a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the PDF structure itself facilitates the attack by directing users to potentially harmful websites.

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://cctraff.ru/123?utm_term=2014+subaru+outback+owner%2527s+manual In PDF document text
    • https://cdn.sqhk.co/zexukobesu/jPjhBig/97105435745.pdfIn PDF document text
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/kulir.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/708712.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/gdWhgja/descent_road_to_legend_app_faq.pdfIn PDF document text
    • https://cdn.sqhk.co/bifugudawesu/iq7hhhj/anil_kapoor_laadla_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/bjdZiap/borunizezifimutibozil.pdfIn PDF document text
    • https://kixawusufeni.weebly.com/uploads/1/3/4/5/134503631/mubulebopu_redofugodato.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wegugus/99563912245.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/hydrofluoric_acid_msds.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/vulivelunojutufunenavawus.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/tubi_tv_activate_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/estadistica_descriptiva_probabilidad_e_inferencia.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/86031612755.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 5428 bytes
SHA-256: 077479301b7dee7d21a5277e0a36cae6241663e06586aff94ec08e7d1ed89130
font_01_sfnt_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 12052 bytes
SHA-256: 6bae0f4536689f0aad69c086776f5f8090921006d42c7224b183e7f527473d34
font_02_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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