Malicious PDF — malware analysis report

Static analysis result for SHA-256 b871b10a10bc21cc…

MALICIOUS

PDF

74.4 KB Created: 2021-03-04 02:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 57c0268c5308d3382197243576101052 SHA-1: 731163aa3efd98dc7c55d5d28de132e47b3b8828 SHA-256: b871b10a10bc21cc738acee6812481eb7ca626b3b12662fb475470be39932845
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, likely for further exploitation.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://kuzutuzo.ru/strik?utm_term=safety+first+dino+walker+instructions PDF link annotation
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/3781187.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/lihgiYJ/ziwurobiku.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/wmajinX/68356622953.pdfIn PDF document text
    • https://cdn.sqhk.co/tititafoza/bghhchc/100_hits_blues_rock.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/gijcHPD/free_gems_clash_of_clans_no_human_verification.pdfIn PDF document text
    • http://wowezixuxaxu.22web.org/39358403026.pdfIn PDF document text
    • http://xonejalevesezom.sportsontheweb.net/taylor_swift_love_story_disco_lines_remix_tik_tok.pdfIn PDF document text
    • https://radalumimobexod.weebly.com/uploads/1/3/5/9/135957078/torusijegak_jujep.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/dorobukasawituw/sedixusefuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/weluwixitozaxazogafimitev.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/historia_de_mexico_ii_santillana_bachillerato.pdfIn PDF document text
    • http://kubijizexex.rf.gd/26999147718.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/acapella_untuk_fl_studio.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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 5376 bytes
SHA-256: 18b96c45747703a0297410b61d95d0eebbd3769283737c99f22c751b7f561196
font_01_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 10408 bytes
SHA-256: 223d3b8938ba4c2a8b4aa3d2ce11beb535b1377d0292ba2f625df2ed1b1381ef

Open this report in the interactive analyzer, or submit your own file for analysis.