Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71b942d34d7bf08…

MALICIOUS

PDF

31.0 KB Created: 2020-06-06 12:40:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e818b88a69ba4b518cc17bb72fd60730 SHA-1: 75a762f0ff78ae507ad4dc9cb47745bfd6f82095 SHA-256: d71b942d34d7bf089bfed63df368c7c3ba452bd30af6109f3faeab1a38086438
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by an ML classifier as malicious and contains a large number of external links, characteristic of a link farm or SEO spamming operation. The document body contains the title 'Cantos para posada' and references the wkhtmltopdf tool, suggesting it might be a generated document. The primary attack pattern involves directing users to a multitude of external PDF files hosted on various domains, which could be used to distribute further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://webdisk.shpoppyshawnsshmokedcheese.com/uploads/1/3/0/7/130738623/130738623.html#cantos+para+posada
    • http://mta-sts.mx.randolphroadrunners.org/uploads/1/3/0/2/130270914/ea8249bfc75.pdf
    • http://triplelunagoddess.com/uploads/1/3/1/4/131409597/xerulirinuse-dewov.pdf
    • http://db.dwaggy.com/uploads/1/3/1/4/131452735/260376.pdf
    • http://webmail.sfc-vantaa.fi/uploads/1/3/1/8/131871597/betezivezewobu.pdf
    • http://emobamuseum.org/uploads/1/3/0/7/130776041/6689621.pdf
    • http://mail.linkedlocal.com/uploads/1/3/1/3/131381288/3441039.pdf
    • http://hiercord.com/uploads/1/3/1/4/131437627/luvil-vanexeter-masofakowu-raduti.pdf
    • http://morethanfood.net/uploads/1/3/1/1/131164430/dukosojuta_vutifanizalom_gofipuj.pdf
    • http://academyofgroove.com/uploads/1/3/1/4/131453329/0dea32b7cd.pdf
    • http://webdisk.shpoppyshawnsshmokedcheese.com/uploads/1/3/0/7/130738623/terms.html
    • http://webdisk.shpoppyshawnsshmokedcheese.com/uploads/1/3/0/7/130738623/dmca.html
    • http://webdisk.shpoppyshawnsshmokedcheese.com/uploads/1/3/0/7/130738623/policy.html
    • https://dotivuzuku.files.wordpress.com/2020/06/gurofozatemupuporon.pdf
    • https://wonudat.files.wordpress.com/2020/06/busazadidugiwexod.pdf
    • https://xibelilunaf.files.wordpress.com/2020/06/bukowixatafebizomojumub.pdf
    • https://datarelozaw874436251.files.wordpress.com/2020/06/wasisalabefedilonulumud.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004dde.bin
b863cffbee1a6b21e423adb48ede6015e0b90158b2ae2010442229c3a67555bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DDE 10264 bytes