Malicious PDF — malware analysis report

Static analysis result for SHA-256 209adac9895fed76…

MALICIOUS

PDF

74.4 KB Created: 2021-02-26 11:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7f3d8cfe70fadcf535c9539d78acaf47 SHA-1: 57d5ce9e46e46e48f30f2e858833fdc94d934326 SHA-256: 209adac9895fed76fc94ace5dec0be74ba70a4f48ce9e82bf17b7326397abe56
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://jumiwimov.ru/strik?utm_term=diary+of+a+wimpy+kid+the+ugly+truth+book+to+read+online', is presented as a search result for a book, suggesting a phishing or content-luring tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jumiwimov.ru/strik?utm_term=diary+of+a+wimpy+kid+the+ugly+truth+book+to+read+online PDF link annotation
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/sodudof.pdfIn PDF document text
    • https://nutotawi.weebly.com/uploads/1/3/0/8/130813366/5933354.pdfIn PDF document text
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/bizixoziw_nuxufenagixuva.pdfIn PDF document text
    • https://dowusezawidi.weebly.com/uploads/1/3/3/9/133997386/wenol.pdfIn PDF document text
    • http://andyhongdigital.com/why_did_the_renaissance_happen_in_italyko7mf.pdfIn PDF document text
    • https://migapivali.weebly.com/uploads/1/3/1/3/131381101/2047781.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/adjective_and_adverb_prepositional_phrases_worksheets_with_answers.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/fekaduvopigab/suwuxusuxozutof.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/21722645850.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/auto_dialer_pro-_double_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/3786805140.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/adobe_after_effects_news_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/1786711234.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/kaspersky_antivirus_apk_full_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/19039822242.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/edit_business_card_template_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/sisupodefugowamoronivowok.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_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 5672 bytes
SHA-256: 7767d912fa207f46ff8e3d10716b37f3ebaf5840a36cf417f6dc24e597b2739d
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10516 bytes
SHA-256: ac743d91381e789c81dabd1089459e74f3bd046f5d14253c7f77f8a779bbc899

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