Malicious PDF — malware analysis report

Static analysis result for SHA-256 102a655cf456b62d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 21:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b578772348a63cd9e7ea663df1e04fb1 SHA-1: 7fb0557206ab6a30ffc7f17f354a8d553d67780f SHA-256: 102a655cf456b62d44c5d570224b1054040d4bdc5ca05c2f04d615cc4bae7b87
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=bhagavad+gita+a+parthasarathy+pdf PDF link annotation
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1bc8a62b---45428689166.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/22222427029.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/bisukar.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/27534228966.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/tawilafonojapeberefe.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/74970019258.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/64692835502.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ropaxalexafum.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/melakunaxejijedis.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33618629169.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/44831530274.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/paleveserefudogejupi.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/rabedikafetimagipososo.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/folubarogom.pdfIn PDF document text
    • http://cityfate.com/files/files/17661475960.pdfIn PDF document text
    • http://wernitznigg.at/files/kodev.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/sepili.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/xazipuxoviwinenaduxilel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358e835f925---23293373633.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/mufel.pdfIn PDF document text
    • http://jsdarvin.com/files/20608578548.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/63269310826.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 10608 bytes
SHA-256: 729885dc061a95d6947ece7954d4a1a804c462550ed27dc15db3dcfa6ec346f7
font_01_sfnt_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 18716 bytes
SHA-256: d2bb9c125ef0865e781423523c194f6c252dd5c3e1848224d29a474927d01063
font_02_sfnt_off0001193e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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