Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d8224c4b085e36…

MALICIOUS

PDF

81.2 KB Created: 2021-04-02 02:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 067bc755e7f309fedf01d5018c4f22e0 SHA-1: 9cfe80d0268257ff2bb6f5a0f03a9f9b3228776c SHA-256: 83d8224c4b085e36daf75e9838b805e4864eef771529927f1e153664a4ff447e
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=magic+tree+house+characters PDF link annotation
    • http://lozhobelir.space/makalah_teaching_speaking_for_young_learners3d81f.pdfIn PDF document text
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/ximig_kilekopenilema_fofewipoke_zujagupovoj.pdfIn PDF document text
    • http://rankingcoach-seo.com/jonilufebabezi91cqn.pdfIn PDF document text
    • http://goshop32.site/jisotufetudiluxodofo5igln.pdfIn PDF document text
    • https://nidikibadut.weebly.com/uploads/1/3/1/4/131453007/7736024.pdfIn PDF document text
    • https://valisuzikejuxeg.weebly.com/uploads/1/3/4/0/134017117/fumasuf_serugila_xatotov_jovel.pdfIn PDF document text
    • http://milansit.space/507002828389uh85.pdfIn PDF document text
    • http://rezonansmusic.com/telur_ascaris_dekortikasiibw5p.pdfIn PDF document text
    • http://50offshop.info/history_of_modern_art_7th_edition_ebooku1tzi.pdfIn PDF document text
    • https://nupezodebugu.weebly.com/uploads/1/3/2/3/132302780/gasarezepi-pamera-nedosed-xusebudi.pdfIn PDF document text
    • https://lotureze.weebly.com/uploads/1/3/1/3/131379444/8813732.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/busutafitufe/sujefomevixutumufopiribu.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/84005821664.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/free_homework_answers_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/los_derechos_humanos_universales_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/22077663352.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/diruwovibugabazuxegike.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/army_recipe_cards.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/sidusadawirodokoverekina.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/simple_student_admission_form_in_html.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/prompt_answer_mode_microstrategy.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/21668636430.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_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 4812 bytes
SHA-256: 2c5133a6f6e54e74c6e84a9916e89ef85ed557e07b1f7f08fe56a29169ce859c
font_01_sfnt_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 11520 bytes
SHA-256: 6d148dd2083883d33495de7d1dfd15cfa3e3f127396ee96c862372e8963d8dcc
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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