Malicious PDF — malware analysis report

Static analysis result for SHA-256 461a2f0c8d477320…

MALICIOUS

PDF

66.7 KB Created: 2021-02-14 10:22:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8f3953f79eafaea6a655f5a90067a016 SHA-1: abb72ef97e8af1e550e960675f18972b37949838 SHA-256: 461a2f0c8d477320cac92882851b8630345d53f7bc6b26ba15ffcf5a3ac91943
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs likely serve as lures to malicious websites or further downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wb?keyword=commerce%20commission%20annual%20report%202017 PDF link annotation
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/dogon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479925/normal_5fed5779986d4.pdfIn PDF document text
    • https://duxataravur.weebly.com/uploads/1/3/4/0/134017775/858a473108.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/zatilat_repubunisuwana_bixuze_monetakelofivi.pdfIn PDF document text
    • https://gogukosujupubof.weebly.com/uploads/1/3/5/3/135317205/najasa.pdfIn PDF document text
    • https://lopatitegadusi.weebly.com/uploads/1/3/5/3/135311006/nojegusigiwirowelore.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481852/normal_5ffd4aa0a3525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423428/normal_5fec3deb47759.pdfIn PDF document text
    • https://posenumu.weebly.com/uploads/1/3/0/7/130776111/4613221.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425912/normal_5ffc04910a977.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366627/normal_600607fa05dec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_602644b1747ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5ff035c4a17de.pdfIn PDF document text
    • https://leneguvajetuse.weebly.com/uploads/1/3/1/3/131380977/bokib.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/tawosutosuxi/56054086156.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/disaster_report_4_english_subtitles.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/39448901277.pdfIn PDF document text
    • http://nujowizuwumug.rf.gd/agilent_34410a_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/hyphenated_compound_words_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/angular_reactive_form_set_initial_value.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_off0000c982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 5392 bytes
SHA-256: 537202841dfa2acac01992aaf035394e528304a65f5fd39ce0fd43f0806d7975
font_01_sfnt_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 9764 bytes
SHA-256: 9ca60e4d4f270fa4fb5c22f6a6502b908d2363f8493f71b1e7d0dec0c0850e80

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