Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6af36e9cb0ab32…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 21:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f02a9dcd1f93b207b74dec1c2225f9f1 SHA-1: a0807ae65ac763b6beacc68d776cd4b3e436f5f8 SHA-256: 9e6af36e9cb0ab32383c2f6fdd5eaf2950ccf3a0a3f15f6bcc057e7bad9b2c8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including a link farm on disposable hosting, suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://barcelonacentromedico.es/files/galeria/files/81718790025.pdf In PDF document text
    • http://swiss-ex.com/images/blog/file/bopimaragemudilum.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/jasapita.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/nivobunarirojinove.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qsg222r95o72ssp6jfppfpjfud/linasifitixexudazib.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/12215093929.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/wazotugisapifumakuruki.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/xolesozadofexujo.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/bifozapuzevarotoxijudi.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613449ba91bf8---kasesiwutapolojomanilidu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ijuramem.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/jazefunodu.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/savized.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/veranedegezakakamukuze.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/legapolu.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/mezomawipi.pdfIn PDF document text
    • http://nenorm.com/files/files/49098684053.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/78837046654.pdfIn PDF document text
    • http://jar-ted.pl/file/6716076855.pdfIn PDF document text
    • http://digifast.cz/userfiles/nizod.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/dexeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hunger+games+synopsis+book+1PDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 10940 bytes
SHA-256: 0b1e008334d65dbe652dd707a7d68ab65aa5b48762938a96c0b82a9df90850e7
font_02_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 18844 bytes
SHA-256: 3e3db0be6fccd564ec6ac3c750f90c20299ca59fe23d160807be9ec3bf37260d

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