Malicious PDF — malware analysis report

Static analysis result for SHA-256 9659f5000a3502dc…

MALICIOUS

PDF

44.9 KB Created: 2020-04-16 19:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0a6b273b91d5680119224d8125bd3b46 SHA-1: 9a2f2e691d2893fb1cd3141a9a130863ef2f370b SHA-256: 9659f5000a3502dcd5c88ce973632218ba9600609f80b10ca0a04a6068d335e1
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF file exhibits characteristics of a malicious link farm, with numerous external URLs embedded within its structure. The document body, though partially corrupted, contains references to 'Chess for android phone' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a redirection or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://canariasrural.net/uploads/1/3/0/9/130969829/130969829.html#chess+for+android+phone
    • http://bizroots.net/uploads/1/3/1/3/131398149/zezuroxifugupeji.pdf
    • http://antodesigns.com/uploads/1/3/1/3/131383934/pubovexavujozazi.pdf
    • http://leashcandy.shop/uploads/1/3/1/4/131413148/3074245fba3f4f.pdf
    • http://eds.anglianetwork.eu/uploads/1/3/0/6/130620877/wovimud.pdf
    • http://highcaliberconstruction.org/uploads/1/3/0/7/130775116/d20ce8c.pdf
    • http://trapainchisa.com/uploads/1/3/1/0/131071159/nedisezegebiwa.pdf
    • http://a1flexiblerespite.org/uploads/1/3/0/5/130550995/7ff21f957f.pdf
    • http://madraschristian.com/uploads/1/3/0/4/130483678/zokuzusesire_latumigukowejiv_vojusonom_piwazonebet.pdf
    • http://bradleyfranksconstruction.com/uploads/1/3/1/1/131163914/xuxesawaralateg.pdf
    • http://dk4laminate.com/uploads/1/3/0/6/130604520/ccc401e6af9730c.pdf
    • http://theancientandmodern.com/uploads/1/3/1/1/131164260/linitej-vugux-bowusalap-bumutuvaker.pdf
    • http://ireifh.com/uploads/1/3/0/2/130270823/sakab-lajaguwaximowo-tozivejebigu-defosika.pdf
    • http://islamexico.com/uploads/1/3/0/3/130312983/sosuvipaw-vokot.pdf
    • http://thetwelvenotes.net/uploads/1/3/1/6/131637226/c8942a26f.pdf
    • http://schuttvision.com/uploads/1/3/0/4/130483429/48be611b5317a.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_off0000888d.bin
06f741e00dd91606ab6e690026d4974b23977045556bb1dfb5d542016c3bcb28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x888D 7916 bytes

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