Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e5b018f3f5a79b…

MALICIOUS

PDF

48.1 KB Created: 2020-03-20 11:19:14 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 23f66a4e737ca1f6811e396c8667fefd SHA-1: 40300c7566656daea93e0352adc5f69eabff07c4 SHA-256: 81e5b018f3f5a79b2af90fc7db8dfda93e8e96791e547dde42856670003505fa
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files. This behavior is indicative of a link farm designed to drive traffic to potentially malicious websites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

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://gregseidel4winterpark.com/uploads/1/3/0/6/130605420/130605420.html#baofeng+uv-5r+charger+flashing
    • http://middleclassempowermentzone.org/uploads/1/3/0/5/130551127/fegijide.pdf
    • http://agedcarecertiii.com.au/uploads/1/3/0/4/130435783/rarovagitafibipukur.pdf
    • http://www.estateplanlasvegas.com/uploads/1/3/0/2/130288545/0a7f7f30746add.pdf
    • http://martape.com/uploads/1/3/0/4/130476491/muliw.pdf
    • http://www.pepekanavis.com/uploads/1/3/0/2/130271131/bapimaluratapuzipe.pdf
    • http://courtneygriggseportfolio.com/uploads/1/3/0/7/130775666/kewigefob.pdf
    • http://frenchiemtvic.com/uploads/1/3/0/5/130588206/sekiladut.pdf
    • http://seleneskincare.com/uploads/1/3/0/7/130739073/724115.pdf
    • http://napervillegardenclub.com/uploads/1/3/0/4/130489162/jadexetorewilik.pdf
    • http://www.firearmsandsurvivaltraining.com/uploads/1/3/0/4/130436315/gakumas_vajefovakis.pdf
    • http://www.igementerprise.com/uploads/1/3/0/6/130620989/66be48a582cf4e.pdf
    • http://reneegriggscaregiver.info/uploads/1/3/0/7/130776769/jesebesovidu-noniwa.pdf
    • http://www.evelynfashion.net/uploads/1/3/0/7/130775698/4170737.pdf
    • http://babiesboobiesbreastfeedingsupport.com/uploads/1/3/0/2/130289756/9988288.pdf
    • http://deusartdesign.com/uploads/1/3/0/5/130544541/kobifatoxe-zovevo-buporiroleb.pdf
    • http://altris.co/uploads/1/3/0/5/130543665/3504417.pdf
    • http://dtlholidayfest.com/uploads/1/3/0/9/130969987/f2cdf0af9f3a4a5.pdf
    • http://mta-sts.mail.theorganicredheads.com/uploads/1/3/0/9/130969458/6eb69c8ff3786c.pdf
    • http://paceventures.org/uploads/1/3/0/5/130540085/5564546.pdf
    • http://portcharlottehomesforsale.net/uploads/1/3/0/7/130776572/f4852633b049131.pdf
    • http://5thgradescienceiv.com/uploads/1/3/0/5/130544034/9878754.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_off00009120.bin
30cb3352e0da11eb961722c1e9262fd513b70382087401a267a197917b3d842c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9120 8892 bytes

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