Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b70841a707afc70…

MALICIOUS

PDF

66.9 KB Created: 2021-10-03 07:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d1af5c1f488a15ca52e09c2c33707288 SHA-1: a487f523ec4336461dfefa3cbf4acd7ea5f3b65c SHA-256: 4b70841a707afc7025ae1d31936f2115abb3c67788c897a5e0cd666e48e73930
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further payloads. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.findvoters.com/userfiles/file/10770160962.pdf In PDF document text
    • http://eko-uklid.com/files/file/28531811144.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/65284116863.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/54648587031.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/19447888275.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/kazawewonazepabebaru.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/38794916288.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/jibamesamekodiduzof.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/88900942916.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/wedosojezedul.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8e08d1074---86406551442.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/kogej.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/nidekinalupikaben.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/1697407906.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/lidije.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/13639058583.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/42840418244.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/37622529131.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/lufulojakidujafosamojepu.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/50861347395.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/72194968997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=free+torrent+client+for+macPDF 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_off0000ab29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB29 10308 bytes
SHA-256: 6da9fac4342772b3bf3c3ba5eb259fb683913ffd1ed10e2d4b2da1fa4d32b9a8
font_01_sfnt_off0000c24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24B 14328 bytes
SHA-256: f32aaf6921bc870ed34ed74bd466ffb0518cb011cf508b43f040bb19cc5246c6
font_02_sfnt_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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