Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d94e5daed8c0b81…

MALICIOUS

PDF

98.6 KB Created: 2021-02-26 04:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5ca65d38ac1f9e22a89f62730ce7f9bb SHA-1: 8f0cd08f71c9e0cecd758468816b73fef1c59a12 SHA-256: 8d94e5daed8c0b812b6959449213f434babfa9a9a4324e01a82aa926c72f18c8
214 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the presence of numerous external links indicates a potential for redirecting users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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/strik?utm_term=what+does+al+husna+mean In PDF document text
    • http://harmony-market.ru/milkman_karlson_hacke04b6.pdfIn PDF document text
    • https://lafefetakizin.weebly.com/uploads/1/3/2/7/132712235/rigojarexubesosiwafu.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/35082502503.pdfIn PDF document text
    • http://teenagetutor.net/29226631635g4v13.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/pedibegimubazedatiwuwebu.pdfIn PDF document text
    • http://zipujesilan.22web.org/comprar_converse_plataforma_baratas.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/78606878310.pdfIn PDF document text
    • http://how2clever.com/taurid_meteor_shower_2019_us1dptf.pdfIn PDF document text
    • http://bezugunafagomup.22web.org/51267482875.pdfIn PDF document text
    • http://dalnoboyi.xyz/64013250057i12c3.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/wixatax/59783071793.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/fisiopatologia_da_doena_de_alzheimer.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/1604222809.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/motuxagoxujefirunagovu.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/safopuganepuwipagudi.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/cruise_travel_packing_list_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/76300454832.pdfIn PDF document text
    • http://fotafufoka.epizy.com/3_bachelors_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/star_wars_books_release_dates.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/samsung_xpress_m2835dw_troubleshooting.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014b3c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14B3C 28444 bytes
SHA-256: 8ecdf68544806bdc8320e6bc4513c27dfd7d10e5e1721811393daa7123a19fdc
font_00_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 4984 bytes
SHA-256: 48b8f2cc78294f427097420863c41bc19979992a3b6596629c2680d569a15f54
font_01_sfnt_off000126ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EA 10764 bytes
SHA-256: b5229ee83095115cde9c2affc3be4b426e6aa6c74398f830501ea9d98a0bda06

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