Malicious PDF — malware analysis report

Static analysis result for SHA-256 4870e008c6c47c39…

MALICIOUS

PDF

94.2 KB Created: 2021-01-31 04:16:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1fc8679afdaa347fa8a12bb97c74937e SHA-1: c1d3e6e841b8a920c3766a675d73a6b06caa36c6 SHA-256: 4870e008c6c47c397cdaacaa4c5757c5ed8b88c4d290b7a6b3acb4ba027e7ddc
154 Risk Score

Malware Insights

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

The file is a PDF containing a malicious redirector link to 'https://crophysi.ru/aws?utm_term=latest+android+9+mobile'. This indicates an attempt to lure the user to a potentially harmful website. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://crophysi.ru/aws?utm_term=latest+android+9+mobile In PDF document text
    • http://demask.space/ncert_maths_textbook_class_6bnb6x.pdfIn PDF document text
    • http://soldatskaya6.ru/electric_arc_furnaceujwsg.pdfIn PDF document text
    • http://wosatonosefenaw.iblogger.org/baking_cake_games.pdfIn PDF document text
    • http://gufutaca1.xyz/48879459279w5q5z.pdfIn PDF document text
    • http://sport-stavki.fun/mapa_de_chiapas_carreterashqa3e.pdfIn PDF document text
    • http://kostlike.site/adverbes_comparatifs_et_superlatifs_exerciceswt7v5.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/batoragubukepo/nodikasedojajam.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/55900903888.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/bollywood_songs_320kbps_free.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/wixam.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/72118328713.pdfIn PDF document text
    • http://pilojoduzige.epizy.com/55272899131.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/59782643805.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/45961968412.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_off00013441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13441 5208 bytes
SHA-256: fb227c21f80d1f880dc850858c7789ea3c167fc929c87c08243fa30da18b0691
font_01_sfnt_off000145d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D5 11008 bytes
SHA-256: 7ba50cf29768595599ffb978d7e37f4e54abb2e9db3e78e7edd73811c42793e7

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